A checkpoint usually represents a certain distance through the game (or perhaps a race track) in which an agent (user or NPC) has succeeded reaching. Reaching (or passing) checkpoints often results in bonus awards, such as extra time, points, ammo, and so on. Also, if a player has multiple lives, then a player will often only be respawned back as far as the most recently passed checkpoint, rather than right to the beginning of the level.
This recipe will demonstrate a simple approach to checkpoints, whereby once the player's character has passed a checkpoint if they die, they are moved back to the most recently passed checkpoint:
In the preceding screenshot, we can see a player-controlled cube on the right. The game area contains three spheres that will kill the player when hit. The game area is divided into three areas...