MultiVersus

MultiVersus is a platform fighter, with players battling on different stages and attempting to knock the opponent beyond the stage's boundary by dealing sufficient damage. While 1-vs-1 and free-for-all options are available, the game emphasizes battling in teams of two characters; most attacks in the game are designed with this in mind, including other players passively strengthening the move's effect. The game initially launched without a ranked queue nor free-for-all, which was present in the open beta. Free-for-all was readded in a post-launch season 1 update, and ranked was readded with season 2.

Season 3 added a "casual queue" mode, similar to the "Co-Op vs. AI" mode from the open beta, "Wacky Weekends", where the aforementioned Rift mutators are applied to PvP, and "Testing Grounds", where new gameplay mechanics, like shields, are trialed for addition in future updates. Season 4 added an Arena game mode, which is a 2v2 mode that pits players against each other and AI. In Arena, players will be locked to one of eight randomly-selected characters may invest in "upgrades" that give themselves buffs.

MultiVersus was the only game developed by Player First Games (PFG), which was founded in 2019 and later acquired by Warner Bros. Games in July 2024. Dedicated servers, rollback netcode, and voice acting were promoted as prominent features, with new content and characters released via periodic updates. The game held a closed alpha test from February 25 to March 8, 2022.

Prior to its announcement in November 2021, rumors of the game surfaced from multiple sources. Initially, a user on the subreddit r/GamingLeaksandRumours claimed that the game was in development as early as 2019 following the release of Super Smash Bros. Ultimate and Warner Bros.' acknowledgement of the Ultra Instinct Shaggy Internet meme. The user also claimed that the idea of a crossover influenced the filming of Space Jam: A New Legacy, although the validity of these claims is uncertain.

The game received generally positive reviews during its open beta. IGN wrote "MultiVersus may not be a must-play at social gatherings, but its refreshing team-based battles make it a great platform fighter online." Play summarized that it was "full of love for the characters, and crunchy to play, you owe it to yourself to give this a go—though the monetisation methods are off-putting." In Japan, four critics from Famitsu gave the game a total score of 32 out of 40, with each critic awarding the game an 8 out of 10.

Its launch on Steam was the most successful for a WB Games title, and the biggest launch for a fighting game released on the platform.