Free Online Multiplayer Uno Card Game Online: Play 2, 3, or 4 Player Uno With Friends in Your Web Browser. System Requirements\n\n Requires a 64-bit processor and operating system. OS *: Originally released for Windows 7, the game can be played on Windows 10 and Windows 11 OS. Processor: Intel Core 2 Quad Q9550 | AMD Phenom II X4 945 or equivalent. |