Gatekeeper: Infinity sends players after the stolen Heart of the Universe, with the quest spanning two planets and twelve challenging locations. That gives its action-adventure premise a defined journey: the goal is to reclaim a powerful object while pushing through hostile territory, rather than simply surviving an endless arena.
Its playable roster offers four characters, each with distinct skills. Those abilities can be developed through 45 upgrades, letting players shape a character around their preferred strengths. Combat also has varied opposition: the game describes 20 enemy types, each with its own abilities and weapons. The combination of character growth and enemy variety makes choosing how to approach encounters part of the adventure.
The game supports single-player as well as online co-op, where friends can join the fight against the machines. The central objective remains the same across those formats, but the option to team up gives the campaign a social route through its locations.