Games like Once Upon A Siege

Games like Once Upon A Siege include Half-Life 2, Titanfall® 2, Half-Life: Alyx, Garry's Mod, and BioShock Infinite. We matched them by the tags players give Once Upon A Siege on Steam (Action, Casual, Sci-fi, Arcade, and Combat): closest matches first, and among equally close ones the better-known games.