● Iron Man: force yourself to restart if you die ● Live Off The Land: use only stuff you find; never buy from vendors ● No Might ● No Magic ● Single Character

And, of course, one can combine those constraints. You might also try to win while eschewing all Light and Dark Magic -- no Spells, Scrolls, or Wands. Have fun, good luck, and please let us know how your game turns out!