HaskellQuest

Enter Haskell City, a world without a defender... at least, not anymore. Its resident superhero, Lambda-Man, vanished after a great battle decades ago, leaving the city defenseless against an onslaught of villains, until a youth stumbles into the Lambda Cave at the outskirts of the city...

Take on the role of the new Lambda-Man in the single-player campaign, or the Purely-Functional Duo in the two-player co-op campaign! Battle your way across three levels, each with multiple challenges designed to teach you all of Haskell's features from list comprehension to recursion! Use your skills to rewrite your enemies' attacks and escape scott-free!

The game is available to download for Windows, Mac and Linux - an internet connection is required to play (even for single-player).

Here's a playthrough video for last year's version - it doesn't showcase the multiplayer, or the improvements to the game's UI and graphics, so I'll be recording a new one soon!