January 17, 2017 4.4 (88%) 5 votes A large inventory of cool math games to play online, Try brain twisters, Fun math activities. Cool and addictive math activities for brain workout for kids. Fireboy and watergirl: Fireboy and Watergirl is an interesting game in which players are provided with a fireboy and watergirl. The blue watergirl and red fireboy are to be moved around the maze and collect diamond but beware of blue, red and green lakes. The blue watergirl must avoid red lakes and red fireboy must avoid blue lakes while collecting diamond. The moment you violate this the game is over as fire and water cant survive when mixed. To make things interesting there is also a green lake which both must avoid and the reach the end of the maze to complete the level.