[Steam] Crypt of the NecroDancer [-90%] [1,47EUR] [HL]

I haven't played the game yet, so I'll let someone else answer that :)

I own AMPLIFIED and love it to death. It expands the story and adds a new dungeon floor complete with new mechanics, characters, enemies, and bosses.

I don't own SYNCHRONY but it sounds like a must if you want to play online multiplayer. It also adds a few new characters (with their own gimmicks of course) so it might be worth picking up just for that.

Then there's the Hatsune Miku character DLC. It's exactly what it sounds like, so only get it if you love Hatsune Miku or want a new dancer-type character to play with.

The rest are soundtracks and "support the developer" DLCs, so no gameplay effects. Buy 'em if you want 'em.

If you want 100% achievements, then you'll need Amplified and Synchrony