One part Diablo 2 (Not 3, we hate 3), One part Little Big Planet, put it together, add in a dragon with a MILLION hitpoints and this is what you get. Fight the Dragon is an action/RPG hybrid entirely composed of user created levels. With over 4,000 adventures to explore and counting there's almost no limit to the insanity you can uncover.

At the heart of Fight the Dragon is the Adventure Creation Kit (ACK!). A built-in game editor/adventure creator that allows you to quickly craft interesting levels full of loot, bosses, traps, events, puzzles, and whatever else your demonic soul desires. Adventures are rated by the adventurers and the cream rises, letting you quickly jump into the top rated levels or take a spin at something totally random and be the first to see what someone has created.

At the end of the day each adventure you complete gives you a chance to combat the legendary dragon, which will kill you... but persevere young adventurer, and one day you'll slay that mighty beast.

More info at http://store.steampowered.com/app/250560/