The first baseball videogame ever. But, as usual with the Odyssey, the gameplay is limited. It's still: player 1 tries to throw ball past player 2, player 2 tries to intercept it and throw back ball past player 1. Another "tennis" variation in fact.
Fortunately, a nice colorful plastic overlay is here to help you think you are actually playing a baseball game. Rules are also quite advanced for an Odyssey game with many subtilities.
Extract from Chronogamer's review: "There are cards you can draw under certain conditions to indicate that an error, wild pitch, or pick-off has occurred. The pick-off is neat because if a batter draws it he can save it until later when he's pitching and use it when he sees fit. A batter can also choose to bunt, or to make a sacrifice fly. You can even have pinch hitters and relief pitchers."