There is only three modes:
Exhibition is a cut-and-dry one game affair.
Season can be expanded across a full season with your chosen MLB team; you won't be able to tweak player line-ups.
Post-Season, it automatically puts you in the chase for the Pennant. Be sure to check all of these out, as they offer some great fun for baseball players.
Atlas is an action-rpg with rogue-like elements where you use your ability to control the ground to fight the enemies and move through procedurally generated worlds.
