Checkpoints are interactive objects in the Gunbrick series.
In Gunbrick unactivated checkpoints appears as a blue block with a white button on top, this block having on it a light blue box with a hole in the middle. An unactivated checkpoint appears as a light blue bar with a white button on top.
When activated, a checkpoint appears as a light blue box with light coloured blue energy moving up. On this box is a rotating white "c". A thin platform checkpoint appears like this but without the blue box.
Checkpoints are encountered throughout Gunbrick and save the player's progress in the level (but not in the game) when activated. When unactivated they appear as a blue box with a button, but when rolled over they transform into a checkpoint. From then on, whenever the player dies they will respawn at the checkpoint until the player activates another checkpoint.
Checkpoints on thin platforms act the same but have a more simpler appearance.
Checkpoints in Gunbrick mobile act the same as in Gunbrick.