A critter hides inside every block. Break every cube that isn't part of it.
A number on a face = how many critter cubes are in that straight row (going through that face).
3 one group,
3 2 groups,
3 3+ groups. 0 = break the whole row. Blank = no clue.
Break knocks a cube out. Mark paints cubes you're sure about; marked cubes can't be broken by accident.
Drag to turn the block. Peel hides outer layers so you can reach the inside.
Breaking a critter cube costs a life and 100 points. 3 lives per stage; lose them all and the run ends.
Stuck? A Hint solves one whole row for you, but costs 250 points. You get 3 hints per run, with no refills.