In the world of competitive racing games—most notably the Mario Kart series—the is a technical gatekeeper that determines whether a lap "counts" or is discarded as a glitch.
Understanding how these invisible markers work is the difference between a world-record "Ultra Shortcut" and a failed stunt that leaves you in last place. The Mechanics of Racing Logic Last Key Checkpoint
: Players must pass through "Key Checkpoints" in a specific order. In the world of competitive racing games—most notably