Grain of Salt

For me it's up (so you're facing the door) and then the left right ctrl button. Kind of a weird setup. I don't remember it being that awkward. Right ctrl also casts the digging spell. Edit: not left. Right. Apparently I don't know the difference. :V

Another interesting game I forgot (albeit one from a few years after the era of Jill/Xargon/Jazz/etc) is Lurid Land. It's a puzzle-based platformer where you play a blue wizard who can't jump, and who is hunted by scary undead knights. It's made up of simple puzzle mechanics like freezing/unfreezing, death from falling, redirecting pipelines, and NPCs who can activate switches. The most reliable mechanic is your basic spell, which can be cast any time (but not anywhere) and which temporarily removes the floor in front of you, letting you fall through (or just trap things). Later on, the simple mechanics combine to create something pretty mind-melting. There are dozens of levels, but I only ever finished a handful.

I am stupid and I forgot to mention the best platform game ever. I actually liked that, despite how annoying it can be. Oh, did you ever play the very last level of Commander Keen 2? I don't know what in the name of Christ they were smoking when they made that, but easily the hardest thing I've seen in a Commander Keen game. I only played the first. Kinda like a stripped down version of Xargon. Some very interesting gameplay modifiers, like transforming into one of the weak phoenix enemies.

Voted for everything except the fanmade Keen games. Instant high five to the seven other people who voted for Hocus Pocus. Also, where's Keen Dreams?