An age-old staple in racing games (especially Arcade Racers), the start boost gives players the extra oomph they need to start each race off right. HotWheels Unleashed is no different in offering a boost, but the difference with this game is that instead of just one boost to try for, players have three different boosts to choose from. Each one offers its own amount of boost power, from 1/4 of a bar to a full one, depending on when the acceleration button is actually pressed.