How to play

Critters drop from the hatch and walk until something turns them. Save at least the number shown under In before the clock runs out by getting them into the glowing exit. Pick a skill in the bar, then click / tap a critter to give it that skill. Every skill has a limited count.

Controls

• − / + release rate: how fast critters drop from the hatch.
• ⏸ pause (P or Space) — you can still pick skills while paused.
• ⏩ fast-forward ×3 (F).
• ☢ nuke: press twice; every critter becomes a bomber. Ends a level early.
• Drag the level (or the minimap) to look around; pinch or mouse-wheel to zoom. Keys 1–8 pick skills, arrows / A–D scroll.
• Falls longer than about six critters tall are fatal. Steel (riveted plates) cannot be dug, bashed or mined.