The brief test period runs for 10 days Halo Infinite players will finally be able to try out campaign co-op when 343 Industries’ test period begins July 11.
The full Halo Infinite campaign will be accessible, however, via online co-op with up to four players.
Apparently, the Halo Infinite co-op is complicated because it lets all players make progress on their own campaigns individually, all while playing together.
During this period, players will also be able to replay Halo Infinite campaign missions with a new feature — Mission Replay, which was missing from the game’s launch last year.