ALTERNA

A pill bug always turns the other way.

Pill bugs have a habit: when they bump into something, they turn the opposite way from their last turn. Right, left, right, left...

You can't move the bug. Place stones, release it, and steer it to eat every leaf. A stone placed far away can flip every turn that comes after it.

Rules

• It walks straight until something blocks the way.
• Then it turns the opposite way from its last turn (the first turn is right).
• If that side is blocked too, it turns the other way, and still wants the same side next time.
• If both sides are blocked, it turns around.

Controls

• Arrow keys: move the cursor
• Z (or C): place / remove a stone
• X (or V) / Space: release the bug (hold to fast-forward)
• Mouse: click a tile to place a stone, click the bug or GO to release
• Enter: menu (reset stones, hint, level select, screen shake on/off)

10 levels + 1 secret. Every level has exactly one solution.
Clear a level on the first try without a hint to earn a ★.

When you solve a level, the bug retraces its path and plays it back as a little melody: high notes for right turns, low notes for left.

Made with PICO-8.

ダンゴムシは、ぶつかると前回と逆の向きに曲がる。石を置いて、葉っぱを全部食べさせよう。