All levels unlocked.
You are a stetson-donned, pistol-armed fellow called Cuboy and you have to navigate thirty levels by shooting targets, which in turn opens up the exit to the level. This often involves shooting the targets while they move and sometimes requires things to be shifted in place.
Cuboy has to jump platforms and hit the targets in certain sequences to unlock the exit.
ARROWS / ASWD – move
LMB – shoot