Boxes with lead, wall fragments are mixed. The prouns move among this chaos. Your task is to destroy the prouns, operating Deactivator. There are only one way to destroy them, to deprive with their movement. Move boxes to push prouns into a trap, but be cautious, your collision with proun will be the last. In Deactivator's arsenal there are small mines with the timer. Its is harmless to the prouns, but dangerous to owner. The mines destroy boxes and block a way to prouns. Deactivator can put/take a mine. Do not forget about the reactor. As soon as proun get into it, a chain reaction will start there. Besides, to be near to a reactor is dangerously - spontaneous emissions of energy are fatal.