back of box Hot Wheels Mechanix puts you behind the wheel of your favorite Hot Wheels race cars and lets you design your own racers. Before you rev your engine, customize your Mechanix car to add bigger tires, a powerful engine, turbo chargers, even wings. Modify your racer as much as your heart desires. Add-ons also accommodate this game's varied environments. Got snow? Add spike tires. And when you're through customizing, it's time for pulse-pounding racing and exciting wins. Win your races and you'll unlock over 18 vehicles, all based on original Hot Wheels designs. Seven 3-D race environments challenge your racing skills. Collect XTool points to buy even cooler upgrades for your Hot Wheels racer.