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Booster is a skill in the Physicist skill tree.

It spawns an item that pushes mice in the direction it's facing on contact.

Unlike springs, which launch you upwards no matter how you come in contact with them, jumping on boosters will significantly impact how they behave, as unlike a spring which mostly "resets" your velocity, boosters only apply a new force to your current velocity. As such, jumping or walking onto the front of a booster will most likely negate its effects.

Walking into or jumping onto the sides will give a moderate boost, and walking into or jumping onto the back will apply the maximum force of the booster.