Marvel Infinity War is a free fangame set in the Marvel universe, developed using the OpenBOR engine. Featuring 78 different characters from various Marvel licenses like Avengers, X-Men, Guardians of the Galaxy, and The Defenders, it offers a rich gaming experience. The game's story mode takes you through locations inspired by The Infinity War, a sequel to the Infinity Gauntlet saga, with Thanos and the Infinity Gems.

In addition to the story mode, Marvel Infinity War offers endless game modes, remakes of iconic titles like Captain America and the Avengers, Spiderman Maximum Carnage, a training mode in the danger saga, and a 'boss rush' mode. With support for up to four players simultaneously, this classic beat 'em up game provides extensive content for Marvel fans.