TAC Heroes: Big Red One for Nintendo DS is a turn-based strategy game set during World War II. Players command the renowned 1st Infantry Division, also known as The Big Red One, through various European battlegrounds. The game combines squad-based tactics with RPG elements, allowing players to upgrade and manage their troops' equipment and abilities. Players must carefully navigate grid-based maps to defeat enemies, complete missions, and advance through the campaign's historical scenarios. Its genre blends military strategy with role-playing progression.