Reverse: 1999 developer Bluepoch teamed up with Ubisoft for an Assassin's Creed crossover in two phases. A collaboration with Ubisoft saw content inspired by Assassin’s Creed II and Assassin’s Creed Odyssey land in-game, including playable protagonist Ezio and multiple story arcs. "Both Reverse: 1999 and Assassin's Creed explore history in unique ways. This introduced Reverse: 1999 protagonist Vertin and friends to the world of Assassin’s Creed II, and broke away from the game’s 20th century identity. The Reverse: 1999 team teases "many paths to take and countless moments to discover" ahead, but "won’t reveal too much" yet.