In Coblyn you explore a cave system in search of diamonds. When you have collected enough the exit will be unlocked, giving you the chance to escape with your treasure, if you can reach it in time. Coblyn comes with 100 levels built-in, and another 200 are available in the Classic Level Pack. Thousands more can be found by searching for level packs in the BDCFF format. The controls for the game are listed in the Help screen. To get an idea of how to play Coblyn, wait at the main title screen and it will cycle through a set of demo games.