Team Fortress 2
The Payload game mode has the offensive team pushing a cart with a bomb on it along a track while the defending team tries to stop them. If the offensive team cannot get the cart to the end of the track before the time limit runs out, they lose. If they are successful, the defending team's base is blown up. Along the track are Checkpoints. Each Checkpoint the offensive team pushes the cart over will give them extra time to get the cart to the end of the track.