Legend of Grimrock just came out yesterday. It's a square based RPG similar to Dungeon Master and Eye of the Beholder. I played a few hours last night and the puzzles are pretty good. I suggest you give it a go.
Bought it some days ago, unfortunately got no mouse at the moment so I'm waiting with playing it. TotalBiscuit's WTF is of it (NOT A REVIEW! STOP CALLING IT THAT) seemed nice so I thought I'd give it a try =)
I have been very impressed with this game. I've made it to the 9th level of the dungeon, and I have been stumped a few times with some of the puzzles (very creative). The combat is surprisingly good, and there is a decent variety of enemies to fight. Oldschool mode is awesome, but can get to be a pain in the later levels (especially when you start exploring the various pits). I would highly recommend this to anyone that played the older dungeon crawlers like Eye of the Beholder, Wizardry, or even Shining in the Darkness.