XCar: Exprimental Racing Cheat Codes
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During gameplay:
CTRL+SHIFT+F8   Change map color
CTRL+SHIFT+F9   Repair damage
CTRL+SHIFT+F10  Clear black flag

At the Track Selection menu:
While selecting a track, hold down S or R to choose the type of weather
        (sunny/rainy)
Hold down M while selecting Single Race or Quick Race to enable the missile.
Then fire it using the HUD toggle key.