Alien Evolution - Game info (player-facing)

This is the “how the game really works” document: mechanics, rules, timings, and the kind of details you want if you’re aiming for clean clears and high scores.

It intentionally avoids anything about disassembly, memory maps, tooling, or how the Python port is implemented. If you want that, see RESEARCH.md.

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What kind of game this is

Alien Evolution is a real-time, grid-based isometric survival/maze game.

You control CYBORG G4 inside a maze. Aliens are already inside the level, and they evolve through multiple phases on a global schedule. In the final phase they reproduce, so the alien population can snowball if you let it.

Your job is simple to state and hard to do:

• Clear the level by reducing the alien population counter to 000.
• Do it before the TIME bar runs out.
• Don’t lose all your lives.

There are 3 levels. Clear all 3 to finish the game.

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Controls (default keyboard profile)

Default “modern” bindings are:

• W / A / S / D - move (up / left / down / right)
• Space - use the currently selected weapon/tool
• E - cycle the selected weapon/tool (MINES → BOMBS → T.N.T → LASER)

Port convenience hotkeys (optional, but useful for practice):

• F5 - quick save
• F9 - quick load
• F10 - reset (back to title)

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The HUD

You don’t need to memorize the layout, but you do want to understand what each indicator really means:

SCORE
Your score increases mainly from: - killing aliens, - “letter” bonus play (see below), - and a fixed bonus on level clear.

LIVES
- You start the game with 6 lives. - You can earn lives back (up to 6) via the letter bonus system. - Contact with an alien (or certain explosions/beam hits) costs a life.

TIME bar
- A per-level countdown. If it hits zero, the level is failed. - It also acts like a “metronome”: key global events are scheduled off TIME ticks.

ALIEN population counter (3 digits)
This is your real objective indicator. - Starts at 004 (because each level begins with exactly 4 aliens: one in each phase). - Increases when aliens reproduce (new phase‑0 aliens appear). - Decreases when an alien is killed/removed (in any phase). - The level completes when it reaches 000.

Hidden in plain sight: this counter also influences how quickly you regain heavy-weapon charges (details below).

Weapon/ammo bars (length 10)
- MINES is a real inventory count (starts at 10). - BOMBS / T.N.T / LASER are “charges” that replenish on evolution pulses (not continuously).

More detail in the Weapons section.

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Core loop: evolution pulses and reproduction

The defining mechanic is the global evolution pulse.

On an evolution pulse, every alien advances exactly one phase:

• Phase 0 (static) → becomes Phase 1
• Phase 1 → becomes Phase 2
• Phase 2 → becomes Phase 3
• Phase 3 → reproduces and returns to Phase 0

Reproduction details:

• A phase‑3 alien attempts to place new phase‑0 aliens into the four orthogonal neighboring tiles (up, right, down, left).
• A new alien is created only if the target tile is empty.
• No diagonals.

So, in open space, one phase‑3 alien can create up to 5 eggs.

Timing: how often is an evolution pulse?

Time is internally frame-driven, but you can treat it like this:

• The TIME bar advances in “ticks” (roughly every couple of seconds).
• Evolution pulses happen on a fixed subset of those ticks (it’s not every tick).
• Early in each level, several evolution pulses happen close together; later, they’re more spread out.

Practical takeaway: the start of a level is where the “evolution tempo” is scariest. If you’re planning a route, plan around that front-loaded pressure.

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Level completion and game completion

A level ends immediately when the alien population counter reaches 000.

• Your time resets for the next level.
• Your lives carry over (you do not get reset to 6 after level 1).
• After level 3, the game shows the ending and then goes to high scores.

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Movement rules

The world is a 50×50 grid. Every move is one tile in a cardinal direction.

Basic collision rules:

• You can move into an empty tile.
• You cannot move into solid terrain (walls), static alien objects, or most “busy” tiles.
• Touching an alien is lethal (either you move into it or it moves into you).

Pushable blocks

Some levels contain pushable blocks.

Rule is strict and simple:

• If you move into a pushable block and the tile behind it (same direction) is empty, the block is pushed one tile forward and you move into its old tile.
• If the tile behind it is not empty, the push fails and you do not move.
• You can only push one block at a time (no chains).

Push blocks are one of the biggest skill multipliers in the game: you can reshape corridors, create safe pockets, and manufacture chokepoints for mine play.

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Teleport pads

Each level has 4 teleport pads.

• Stepping onto a pad instantly teleports you to another pad.
• The mapping is one-way and deterministic: pads form a cycle T1 → T2 → T3 → T4 → T1.
• Aliens treat pads as obstacles (they don’t use them).

If you want to play the level like a chessboard (and for high scores, you kind of do), knowing the exact pad cycle matters.

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Weapons and tools

You have 4 tools, selected by cycling with E. Use the current one with Space.

A key positioning detail:

• MINES / BOMBS / T.N.T are planted behind you (on the tile you just left).
• LASER is fired in front of you (from the tile ahead of your last-move direction).

If the placement tile isn’t suitable (occupied, or not a valid “empty” tile type), the action simply does nothing. (Learning what counts as “placeable floor” is part of routing.)

MINES

What they are:
A reusable trap you drop behind you. Great versus early/mid aliens, also useful as a “point farm” on advanced aliens.

How to deploy: - Press Space while MINES is selected. - A mine is planted on the tile you just left (behind your last move), if that tile is empty.

Ammo: - Start with 10 mines (the HUD bar maxes at 10). - Dropping a mine costs 1. - You regain a mine when: - you walk over one (picking it back up), or - an alien steps onto it (the mine is consumed, but your inventory goes back up by 1).

Interaction: - Phase 1 and Phase 2 aliens die when they step on a mine. - Phase 3 aliens do not die - they consume the mine, you get the mine back, and you still get points. - That makes “advanced‑alien mine farming” possible, but risky.

BOMBS

What they are:
A contact explosive dropped behind you. Think “stronger mine” that creates a small blast zone.

How to deploy: - Press Space while BOMBS is selected. - A bomb is planted on the tile you just left (behind your last move), if that tile is placeable.

Ammo: - Bombs use a 0–10 “charge” bar. - Charges are replenished on evolution pulses, not instantly. - Early in a level you will often have 0 bombs until the alien population grows.

Blast behavior (practical): - When a bomb is triggered, it can kill targets on the bomb tile and also hit adjacent orthogonal tiles (a small “+” shaped danger zone). - Bombs are most reliable against phase 1 and phase 2 aliens. - Don’t step on your own bomb; don’t stand adjacent when it goes off.

T.N.T

What it is:
A heavier contact explosive. Best thought of as your main answer to the phase‑3 adult when you don’t have laser control yet.

How to deploy: - Press Space while T.N.T is selected. - It is planted behind you (same as BOMBS), if that tile is placeable.

Ammo: - Same 0–10 charge bar model. - Replenishes on evolution pulses.

Interaction (high-level): - T.N.T is the most consistent “placed” tool for killing phase‑3 aliens. - It is also dangerous to you in close quarters: treat it as a do-not-touch object once planted.

LASER

What it is:
A forward attack. Used correctly, it’s the cleanest way to delete high-value targets (including static phase‑0 aliens), and the safest way to stop reproduction chains.

How to deploy: - Press Space while LASER is selected. - The emitter/beam originates in front of you, in the direction of your last movement.

Ammo: - Same 0–10 charge bar model. - Replenishes on evolution pulses.

Interaction: - Laser hits can kill aliens in any phase (including the static phase‑0). - It can also kill you. If you’re learning the timing/geometry, practice with quick-save.

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Heavy-weapon recharge: the exact rule

BOMBS, T.N.T and LASER do not recharge “continuously”. They recharge only when the game runs an evolution pulse, and the amount depends on the ALIEN population counter.

Let the population counter be a three-digit number:

• hundreds digit = H
• tens digit = T
• ones digit = O

Recharge bias per evolution pulse:

• If H > 0 (population ≥ 100): you gain +10 charges (capped by the 10‑segment bar).
• Otherwise: you gain +T charges.

This bias is applied to each of the three heavy tools (BOMBS, T.N.T, LASER), then each bar is capped at 10.

Examples: - Population 004 → T = 0 → heavy tools won’t recharge. - Population 17 → T = 1 → +1 charge per evolution pulse. - Population 58 → T = 5 → +5 charges per evolution pulse. - Population 103 → H > 0 → +10 (full recharge).

Practical implication:

• If you keep the population under 10 for the whole level, you’ll often be playing almost entirely with mines and movement tech.
• If you let the population climb into double digits, the game starts feeding you heavy tools - but you’re also playing with a bigger infestation.

That tradeoff is one of the game’s main strategic levers.

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Enemy phases and behavior

The game does not use one generic “alien AI”. Internally there are four live enemy queues, and each queue has its own update rule.

Exact per-frame enemy update order

On each gameplay frame, enemy logic runs in this order:

1. A global 3-step animation phase advances (0 -> 1 -> 2 -> 0).
2. Phase 1 movers update.
3. Phase 2 movers update.
4. Any already-active adult shot advances.
5. Phase 3 / adult movers update.
6. Phase 0 statics update (they do not move; they only toggle their display state).

That order matters:

• Phase 1 and Phase 2 can die on mines before adults get their turn.
• Adults can only arm a shot after their movement step, and only if no earlier adult shot is still active.
• Phase 0 is truly static between evolution pulses.

The four real runtime states

• Phase 0 / queue 0 - static seed. No movement. The only per-frame change is a visual toggle (0x19 <-> 0x1A).
• Phase 1 / queue 1 - direction-preserving roamer.
• Phase 2 / queue 2 - the same base mover as phase 1, but with a different per-level “two tiles ahead” danger check.
• Phase 3 / queue 3 - adult mover. This is not true pathfinding to the player’s coordinates. It mostly keeps direction, and when it needs a new direction it tries to copy the player’s last move direction. On levels 2 and 3 it can also fire a straight-line shot.

Shared movement model for Phase 1 and Phase 2

Each moving alien stores one of four direction bits:

• 0x01 = step -1 (one column left)
• 0x02 = step +1 (one column right)
• 0x04 = step +50 (one row down)
• 0x08 = step -50 (one row up)

On its turn, a phase-1/phase-2 alien does this:

1. If it is already in the death-animation state, it does not move. It advances through a short 3-step removal sequence and only then disappears and reduces the alien counter.
2. If it is currently standing on an explosion marker (0x38), it is forced into that death/removal sequence immediately.
3. It probes two tiles ahead in its current direction. If that exact tile matches the current level’s threshold code, the alien does not move this frame and instead picks a new direction.
4. Otherwise it checks the tile one tile ahead:
5. Empty -> move one tile and keep the same direction.
6. Mine (0x25) -> move onto the mine, consume it, refund the mine to the player, and enter the death-animation sequence.
7. Any blocked low-code tile (< 0x1D) or an explosion marker (0x38) -> do not move; pick a new direction instead.
8. Anything else -> move into it.

Two important consequences:

• Teleport pads live in that blocked low-code range, so aliens do not use them.
• Most weapon/effect tiles are not treated as hard obstacles by the mover itself; the consequence is handled by the effect system after or around the move.

The “pick a new direction” part is not true randomness. The ZX routine seeds it from LD A,R, so in the port it follows the shared approximate R-register sequence rather than the frame counter. In practice it still feels like a lightweight deterministic turn rule, but repeated fallback calls inside one gameplay frame do not all have to pick the same turn.

Adult / Phase 3 logic

Adults use the same four direction states and the same one-tile move size, but their retargeting rule is different.

On its turn, an adult does this:

1. Death animation / explosion handling works the same way as for phases 1 and 2.
2. It probes two tiles ahead in its current direction. If that tile matches the adult threshold code for the current level, the adult does not move; it switches to fallback-direction logic instead.
3. If the next tile is blocked by a low-code obstacle (< 0x1D), by an explosion marker (0x38), or by an already-armed adult-shot marker (0x39), the adult again stays put and goes to fallback-direction logic.
4. If the next tile is a mine (0x25), the adult does step onto it and the mine is consumed/refunded, but the adult survives.
5. Otherwise the adult moves one tile forward.

The crucial correction to the old description is the fallback rule:

• The adult does not calculate a route to the player’s current position.
• When it needs a new direction, it first looks at the player’s last move delta.
• If the copied lane passes the same immediate/two-tiles-ahead checks, the adult changes state to that direction and waits for its next turn.
• If even that copied lane is rejected, it falls back to the same deterministic R-seeded direction chooser used by the roamers.
• At the start of gameplay there is no prior player move yet (move_delta == 0x0000), so the first forced retarget goes straight to that chooser until the player has moved at least once.

So the adult is best described as “keep going until forced to retarget; then try to copy the player’s most recent heading”, not as a true coordinate-seeking chaser. That is why on level 1 it often does not feel like it is directly homing in on you.

Adult ranged attack (levels 2 and 3 only)

The ranged attack is enabled by a level patch; it is completely disabled on level 1.

After an adult successfully moves, it tries to arm a shot only if all of these are true:

• level 2 or 3 is active,
• no earlier adult shot is still active,
• player and adult are on the same row or the same column,
• the adult is already facing toward the player,
• the adjacent tile in the firing direction is empty.

If all checks pass, the game writes a shot marker into that adjacent tile and stores a direction seed for the adult-shot executor.

Practical meaning:

• the shot is a straight row/column attack,
• it is only armed after the adult has moved,
• it does not require a full clear lane at fire time - only the very first tile has to be empty,
• on later frames the shot is advanced by the same straight-line propagation core used by the player’s laser,
• walls/objects farther down the lane stop it during propagation.

Level-by-level AI patches

Level 1

• Phase 1: no two-tiles-ahead threshold patch.
• Phase 2: no two-tiles-ahead threshold patch.
• Adult: no two-tiles-ahead threshold patch.
• Adult shot: disabled.
• Result: the adult only retargets when its current lane is rejected, and that retarget is based on your last heading, not your exact coordinates.

Level 2

• Phase 1: same as level 1.
• Phase 2: if a mine is exactly two tiles ahead, it turns away instead of walking straight into that line.
• Adult: if a wall is exactly two tiles ahead, it retargets instead of continuing straight.
• Adult shot: enabled.

Level 3

• Phase 1: now also gains the wall two-tiles-ahead turn-away rule.
• Phase 2: keeps the mine two-tiles-ahead rule from level 2.
• Adult: keeps the level-2 wall lookahead and the ranged shot.

Death/removal timing

When a moving alien dies (for example by stepping on a mine), removal is not instant. The queue state goes through a short 3-step animation sequence first, and the alien counter drops only when the final cleanup happens. So in tight corridors a just-killed alien can briefly remain in the lane before the population counter catches up.

The letter bonus (extra lives) - how it really works

Periodically, a single bonus marker spawns on a random empty tile.

• The marker cycles through 5 symbols/letters very quickly.
• When you step on it, you “collect” the letter it is currently showing.
• The marker is consumed on pickup (you’ll need a fresh spawn for your next letter).

Rules (critical details):

• Each of the 5 letters can be collected once per set.
• If you pick up a letter you already collected in the current set, you simply don’t gain a new letter (but you still get the “bank” score for your current progress; see below).
• When you successfully collect all 5 unique letters in a set:
• you gain +1 life (up to the max of 6),
• the set resets,
• and the next marker starts a new set.

Scoring: - Picking up a new letter gives points immediately. - Every pickup (new or duplicate) also gives “bank” points equal to how many unique letters you currently have in the set.

Expert takeaway: - This is not just a life mechanic - it’s a scoring mechanic with timing. If you want big scores, you need to be deliberate about which letter you pick up on each marker spawn.

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Scoring details

If you’re chasing high scores, here’s what matters:

• Alien kill: +1 point (credited when the alien is actually removed after its death animation).
• Mine contact events also give points (including phase‑3 stepping on a mine, even when it survives).
• Letter bonus play gives a steady stream of points and also restores lives.
• Level clear bonus: +500 points (awarded as a rolling count-up on the HUD).

There is no time‑remaining bonus. If you farm, you are trading away time for points and (maybe) lives.

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Expert techniques and patterns

This is not “how to survive your first run” - it’s the stuff that tends to matter when you’re optimizing.

Population management (weapon economy control)

Because heavy tools recharge based on the tens digit of the alien population, you can deliberately choose between: - keeping the population low (safer, but mostly mine-only), or - allowing controlled growth into double digits (riskier, but it unlocks a steady flow of bombs/T.N.T/laser).

A common high-score pattern is: stabilize with mines, allow a planned growth spike, cash in heavy tools to wipe, then repeat - without ever letting phase‑3 reproduction chain out of control.

Mine kite loops

Mines are planted behind you, and phase‑1/2 aliens die on contact. That makes classic “run a loop through a corridor and salt the floor” extremely strong.

Against phase‑3, mines don’t kill - but they still: - remove the mine from the floor (reducing clutter), - refund the mine to your inventory, - and award points.

So phase‑3 + mines can be used as a point engine, as long as you keep the line‑attack risk under control (levels 2–3).

Teleport routing

Teleport pads are deterministic and one-way. The skill isn’t “react and hope” - it’s: - knowing which pad will send you where, - knowing what safe space exists around the destination pad, - and using the cycle to reposition without giving phase‑3 a clean line.

Adult shot denial (levels 2–3)

An adult can fire only when: - you share a row/column, - it is already facing toward you, - the tile directly in front of it is empty, - and no earlier adult shot is still active.

You can deny shots by: - staying off the same row/column, - forcing its facing away from you (important: adults retarget from your last move direction, not from your exact position), - forcing it to approach behind walls/blocks, - or deliberately “cluttering” the tile directly in front of it (careful: this can also limit your own tools).

Letter discipline

Because each marker pickup is consumed, your letter play becomes a timing game: - Don’t pick up a marker unless it’s showing a letter you actually want, unless you’re intentionally cashing bank score. - If you’re low on lives, prioritize finishing the 5-letter set even if it costs a bit of time.

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Appendix: evolution tick schedule

For players who want to route around the exact cadence:

• Each level’s TIME bar consists of 22 internal ticks.
• On 11 of those ticks, aliens also run an evolution pulse.
• The evolution ticks (counting from the first tick of the level as step 21 down to 0) are:

21, 20, 19, 18, 16, 14, 13, 10, 7, 4, 2

This is the same on every level.

Level reference

For each level you get: - a unique map layout, - the same fundamental evolution system, - but stronger alien behavior in later levels.

Level 1

Map (isometric):

Key facts:

• Player start: (r27, c25)
• Starting aliens (one per phase):
• Phase 0 (static): (r05, c04)
• Phase 1 (roamer): (r25, c02)
• Phase 2 (roamer): (r27, c47)
• Phase 3 (adult): (r40, c25)
• Pushable blocks: 22
• Teleport pads: 4 (see table below)

Teleport cycle:

Pad	Location	Sends you to	Destination
T1	(r07, c25)	→ T2	(r29, c25)
T2	(r29, c25)	→ T3	(r44, c04)
T3	(r44, c04)	→ T4	(r44, c44)
T4	(r44, c44)	→ T1	(r07, c25)

Level 1 enemy notes: - No enemy class has its level-specific two-tiles-ahead threshold patch here. - Phase‑3 adults do not use the ranged shot here. - When a phase‑3 adult has to retarget, it copies your last move direction; it does not pathfind to your current coordinates.

Level 2

Map (isometric):

Key facts:

• Player start: (r13, c09)
• Starting aliens (one per phase):
• Phase 0 (static): (r36, c24)
• Phase 1 (roamer): (r03, c44)
• Phase 2 (roamer): (r02, c14)
• Phase 3 (adult): (r46, c42)
• Pushable blocks: 28
• Teleport pads: 4 (see table below)

Teleport cycle:

Pad	Location	Sends you to	Destination
T1	(r13, c04)	→ T2	(r15, c31)
T2	(r15, c31)	→ T3	(r29, c42)
T3	(r29, c42)	→ T4	(r37, c10)
T4	(r37, c10)	→ T1	(r13, c04)

Level 2 enemy notes (difficulty bump): - Phase‑2 movers turn away if a mine is exactly two tiles ahead in their current direction. - Phase‑3 adults turn away if a wall is exactly two tiles ahead in their current direction. - Phase‑3 adults can arm the ranged shot if you are aligned and they are already facing you.

Level 3

Map (isometric):

Key facts:

• Player start: (r10, c10)
• Starting aliens (one per phase):
• Phase 0 (static): (r19, c31)
• Phase 1 (roamer): (r23, c04)
• Phase 2 (roamer): (r32, c23)
• Phase 3 (adult): (r25, c45)
• Pushable blocks: 28
• Teleport pads: 4 (see table below)

Teleport cycle:

Pad	Location	Sends you to	Destination
T1	(r04, c04)	→ T2	(r04, c45)
T2	(r04, c45)	→ T3	(r44, c04)
T3	(r44, c04)	→ T4	(r44, c44)
T4	(r44, c44)	→ T1	(r04, c04)

Level 3 enemy notes: - Phase‑1 movers also gain the wall two-tiles-ahead turn-away rule. - Phase‑2 keeps the level-2 mine two-tiles-ahead rule. - Phase‑3 adults keep the level-2 wall lookahead and the ranged shot. - Overall navigation pressure is higher because of the layout and block placement.

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Top-down schematics (50×50)

These are not required to play, but they’re extremely useful for routing and for understanding how teleport pads and chokepoints relate.

Legend: - # wall - B pushable block - T teleport pad - P player start - s static alien start (phase 0) - e roamer start (phase 1) - m roamer start (phase 2) - A adult start (phase 3) - . empty

Level 1 schematic

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Level 2 schematic

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Level 3 schematic

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