Mechs can only take a limited amount of damage during battle before becoming inoperable, though a player can have a mech idle a turn to repair some damage battle damage is otherwise completely repaired between maps. This gives the player the ability to then move each mech and fire one of its weapons as to either defeat the Vek unit, push the Vek off a line of attack, avoid an attack, intercept newly spawning Vek or an attack on civilian structures. The appearance of new Vek follows each turn. The player is shown the direction of the Vek unit's intended attack and information on the number of moves the Vek unit is able to take and its remaining health are available on screen. On each turn, Vek forces will move across the board and attack. Should a civilian structure be damaged or destroyed, the power grid is weakened. The principal goal for any map is to protect civilian structures which support the power grid that supports the mechs, but additional objectives may be presented. In combat, the player controls three different mechs against the Vek, and will be given an objective for that map along with a fixed number of turns to complete that objective. The game uses a turn-based combat system, allowing the player to coordinate the actions of their team in response to enemy moves and actions that serve to telegraph their attacks.

To combat them, the player controls soldiers that operate giant mechs that can be equipped with a variety of weapons, armor, and other equipment. Into the Breach is set in the far future where humanity fights against an army of giant monsters collectively called the Vek. It was released for Microsoft Windows in February 2018 and for macOS and Nintendo Switch in August 2018. It features writing by Chris Avellone and music composed by Ben Prunty. Into the Breach is their second game, following FTL: Faster Than Light. Into the Breach is a turn-based strategy video game developed and published by indie studio Subset Games, consisting of Justin Ma and Matthew Davis.

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