Shapes drift in. The dock only swallows the shape it asks for, in order. Pull them home, push the wrong ones away, and do not let the arena clog.
Move with arrows or WASD, or drag on the board. Space or the button flips your field between PULL and PUSH. Deliver shapes in the order shown at the top.
Arrows/WASD move · Space flip · P pause · Enter start. Touch: drag to steer, tap the board or the button to flip.