User blog comment:ChocophileBenj/ChocophileBenj's second contest : conveyor belts !/@comment-30095342-20141203212916

The conveyor belts in the top left and bottom right go clockwise. The other two go anticlockwise.

The dispensers will at first release a key. Only one key may be dispensed from each dispenser. After the key is dispensed, there is a 50-50 chance the dispensers will spawn a 15-move bomb.

(BTW: I really wish there were proper corner pieces for the conveyor belts in the editor, but I haven't been able to figure out how to draw some yet)