Free online games that envolves racing, specially car and motorcycle races. It can be sport racing (sanctioned) like Formula 1 games or underground racing like Out Run or Need For Speed Underground.
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Formula 11 Micro is a fast racing game which is full of action and tracks across the world. There are also multiple race cars to unlock and boosts on the tracks. Beat your opponents on the track and get a position on the next stage.
Heat Rush USA is an excellent arcade-like racing game inspired on the classic Out Run, that features great controls and speed feeling that are rarely seen in Flash games.