You can move left/right and you can also jump. The main feature of the game is that when a square dies (turning gray), another cube will respawn. This is necessary sometimes as you may use the previous dead squares to navigate the map. Death is caused by touching spikes. The dead cubes are rather heavy, and thus hard to move. Be careful where the remains of previous squares lie, you may trap yourself. Additional obstacles are spinners (which inflict death upon impact), buttons which open doors (hint: dead squares can press buttons), and lasers (hint: dead squares block laser light).