Name: Gyroscope
Effect: Dampens the wobbling of platforms slightly, giving the player a bit more time before the platform starts falling over. (maybe just make it have lots of air resistance?)
Ammo: 2

Name: Physics repulsion mine
Effect: Just like the repulsion mine except it repels platforms and not players. Activates after 5 seconds.
Ammo: 1

Name: Explosive repulsion mine
Effect: Pushes players in the area when someone stands on it. Arming time is 30 seconds.
Ammo: 1