HardBall! uses a behind-the-pitcher baseball perspective for the main action. The player alternates between pitching, batting, and fielding, with the objective of scoring more runs than the opposing team over a regulation game. Pitching requires selecting a pitch and trying to place it effectively, while batting depends on timing and reading the delivery.

Games are structured as standard baseball innings rather than a level-based campaign. The player must manage outs, balls, strikes, baserunners, and defensive plays. Progression comes from completing games and improving execution; there is no documented role-playing progression system or unlock tree.

Vary pitch selection and placement instead of repeatedly using one delivery. Watch the count: strikes increase pressure on the batter, while balls can create dangerous baserunner situations.

On offense, wait for a pitch you can time well rather than swinging at every delivery. On defense, prioritize the most immediate out and track runners before attempting aggressive plays.