First one up is the slime bomb! it would work by splatting the ground with sticky slime, that when over makes you slower and jump lower. (Like honey in minecraft.) It would be extra good with bomb, because it would slow the bomb down on the ground and blow up the enemy. Rock could pickup the slime and roll down more. (Yes i'm evil.)

Its a portal gun... place 2 portals to travel between! Wouldn't combo much but at least it work to stop stalemates of a gap between the only platforms.

Yes, time bomb. How it would work is it has a timer (duh) that after 3 seconds it will explode, but for that 3 seconds its solid and moveable. It could have a feature where if it was grown it would double the time and if it was shrunk it half the time. Also has larger explosion than mine. (for balance)

This one is something, place a guy that will walk along all the platforms he can (with the roll ability pathfinding) until he gets near someone and explodes instantly, max 3 of the guys, anymore explodes the first. Yes it has a timer but its like a minute so you won't have to strategize around it. I think it would be most useful in those situations where someone is camping trying to shoot you with a arrow because unlike you this toy is invincable!