The Metronomicon: Chiptune Challenge adds 3 new songs, challanges and few new items. Three new songs are all really enjoyable. You can also make your own party setup for the dungeon, which is a nice change. There are also challanges, those are well made and thought out, mostly because it gives pretty interesting equipement to experiment with. This DLC is also nice endgame, because it is harder than the main game, although maybe little too hard. However, difficulty got slightly balanced in another DLC for this game, indie challenge, where the game is slightly easier. It is the same high quality, nice looking and great sounding game with addicting rythm gameplay. If you've thought that main game of Metronomicon was too easy, this will make your endgame really fun and challenging, not only with pretty hard tunes to master, but also highscores to beat. If you don't want to be frustrated by difficulty, though, you should pick up indie pack. Still, with price like this, it's hard to pass. Strongly recommended.