The official web version of Minecraft Classic is available to access and play for free for everyone. You can play it on any modern web browser (like Chrome, Firefox, Edge, etc.) on a Windows 11/10 computer or another device. Just open its homepage and start the game. But, do note that this game requires a keyboard. So, if you will try to open it on a smartphone, you will get a message Please try again on another device, unless you turn on the Desktop site option on the web browser on your smartphone.