7DRL is great also because it provides an opportunity to expertiment completely new gameplay mechanics.
What are your favourites?
Some awesome ones I remember:
- Darkness
The fact that darkness gradually turns you mad.. you start hallucinating stuff.. and mind becomes matter.. truly metaphysical, innovative, and also fun to play.
- A Quest Too Far
Instead of grinding your way to minmaxxing your character, you start already strong and well equipped, and your strenght vanishes the more time you spend in the dungeon. Innovative and fun.
- Kobolds
Fight your way through a horde of kobolds.. who keeps throwing small missiles at you, insulting, and evade you. Very fun.