PaperGames.io, a multiplayer io game, allows you to play classic games like Connect 4, Gomoku and Tic-tac–toe (Noughts & Crosses). Sign up online, select your username and choose a game. You can then test each one against other players!PaperGames.io, a multiplayer io game, allows you to play classic games like Connect 4, Gomoku and Tic-tac–toe (Noughts & Crosses). Sign up online, select your username and choose a game. You can then test each one against other players!