Gamebox Sports Series (Sega Master System)

Game Box Série Esportes Radicais (which means Game Box Radical Sports Series) is a modified version of California Games. Four of its six events were removed and now the player can only compete in the Surfing and BMX events. The team selection (sponsorship) was also removed, as well as the ability of naming the players. Each player will get a default name (PLAY1, for instance), and the game will select teams in order (player 1 gets Maxx-Out, player 2 gets Costa del Mar, and so on). The trophy screens were also removed, so the player don't see the team logo on it. Players only know to which team they are assigned to during the event competition, when their names and team names appear on the top of the screen.

Up to eight players can take turns competing in either one of the two events, or both. They can also choose to practice in one single event.

In the Surfing event, players must perform maneuvers on the wave as trying to keep as long as possible inside the tube, or jumping off and on the wave. The board's speed can be brought up by climbing and descending the wave, and be slowed down by holding button 2 while maneuvering. When the time runs out, the judges will tell the score.

In the BMX event, players must perform jumps and maneuvers while trying to complete the course. The bike is accelerated by pressing button 1 repeatedly and jumps can be performed by pressing button 2. While in the middle of a jump, pressing different directions on the d-pad will make the biker perform different kinds of jumps. The more dangerous the maneuver, the more points are awarded. If bikers crash three times, they are eliminated.