Premise: Assassin's Creed . The main videogame series consists of nine games , developed by Ubisoft Montreal ( single player ) and Ubisoft Annecy ( multiplayer ) , released on PlayStation 3 , PlayStation 4 , Xbox 360 , Xbox One , Wii U , Microsoft Windows , and OS X platforms .
Hypothesis: Assassin's Creed has only ever been released on a Microsoft and Sony platform.
Label: CONTRADICTION