There isn't much to say here since this is a full application and not a library. It's web based minesweeper, but without any JavaScript. Everything is done server side and the server is stateless.

Some cool things that means.

• Bookmarking a game saves the game.
• Sending another person a link of your game will let them play the exact same game.
• Backspace and forward work.
• Backspace and forward always work.