- To enable or disable fullscreen mode, click on Options... and then Video Settings... and toggle Fullscreen: ON or Fullscreen: OFF.
- To change your username, click the little Steve icon at the top left of the game.
- See the guide to learn the basics and how to play Survival mode.
About Minecraft 1.5.2
This is the offical, outdated version of Minecraft. Since Minecraft 1.6, Minecraft can't be played through the web browser, so this is the latest browser compatible version. For singleplayer you can play Survival, Hardcore, or Creative Mode. If you are able to find an unofficial server, Multiplayer can be played as well.