Mater's Countdown Cleanup is a hidden minigame in Cars: The Video Game. It can only be unlocked in the Wii and Xbox 360 versions of the game by typing "TRGTEXC" in the Cheat Codes. However, it does exist in the code of the PC version.
Goal
The goal is to run around Radiator Springs and pick up as much littered junk as possible before time runs out. The timer starts at 30 seconds, and each piece of junk collected will add more time. Crates add 3 seconds, Oil Cans add 5 seconds, and Tires add 10 seconds. The objective is to collect up to 100 pieces of junk. After having reached this goal, the game will keep going, to see how much longer you can last before time finally does run out. The junk will eventually start respawning after some time, meaning that the game could go on indefinitely. The Results Screen will display how long the player lasted before time ran out, and how much junk they successfully collected before then.