Checkpoints are represented as a flagpole which has to be touched to activate. The ground beneath the checkpoints is almost indestructible. There are two types of checkpoints.
Sets a respawn point where new bros are spawned upon death.
In multiplayer, they can be used to bring back eliminated players if someone player activates it.
When all lives are lost, the level restarts from there upon activation.
In multiplayer, upon activation all players with no lives left will be brought back to life.