Tee Ball is a modified version of baseball. The major modifications include no pitching, hitting the ball off a "tee" of adjustable height, a reduced time of play (usually an hour) and playing on a diamond which is only two-thirds of the senior size. It also incorporates an important rule on the length of an innings to prevent a stronger team monopolising the batting during a game. Tee Ball caters for boys and girls from 5 to 12 years of age.

Rookie Ball is also a modified version of baseball. The only difference between Tee Ball and Rookie Ball is that an adult will pitch to the batter, instead of the batter hitting off a tee. Rookie Ball introduces the players to the concept of hitting a moving ball.

The games provide a lot of fun, opportunity for rapid improvement in ball skills, hand-eye coordination and general confidence, as well as one hour of fast moving exciting involvement during the game itself. Parent and family participation as well as business sponsorship have reached unprecedented heights for children's sport.