World Class Baseball is a baseball game. The player controls the pitcher and fielders through an automatic system that gives them control over one of the players closest to the ball; not the batter. One or two small windows display the runner's status during the face-off between the batter and the pitcher. Once the ball is hit, the view changes to a bird's eye view, showing a good portion of the game field where the action is taking place, together with a permanent small field's image at the right bottom of the screen displaying the position of every player on the whole field.
The game features various modes, including an arcade mode (Pennant mode) where the player must defeat one by one all opponent teams; a two-player mode (Versus mode) where two players compete against each other in a single game; an "Open" mode to challenge the computer in a single match; and a computer-only mode (Watch mode), seeing a challenge between two teams both controlled by the CPU. The Edit mode allows the player to change the starting lineup and starting rotation for the team.
The game is divided into two groups: South Division, consisting of teams from Bangkok, Beijing, Moscow, Paris, Rome, Sydney; and North Division, counting teams based in Chicago, Los Angeles, London, New York, Tokyo, Toronto. No official licensed baseball teams are featured.