Download the levels you want and move them to the Levels folder in the Spelunky directory. When you start up Spelunky, press F3 while in the main menu, select a level, and enjoy! (Level files have a .lvl extension. If a level was posted in code form, copy-paste it onto a text file (eg. in Notepad) and save with a .lvl extension) Many more levels await you in the official level-sharing forum, and inside the the unofficial spelunky level database ().