'''Bolts''' are the in-game currency to buy upgrades in the [[Game Modes|Endless game mode]]. During every stage, you can get three bolts by these methods: finishing a [[Missions|mission]], getting the bolt somewhere in the stage and/or reaching stations. | '''Bolts''' are the in-game currency to buy upgrades in the [[Game Modes|Endless game mode]]. During every stage, you can get three bolts by these methods: finishing a [[Missions|mission]], getting the bolt somewhere in the stage and/or reaching stations. |