A bold attempt at resurrecting the first-person dungeon crawler genre, Grimrock combines tile-based movement with blow-and-cooldown combat, puzzles and RPG elements.
I got a hold of them and asked about multi-monitor support, and got this reply:
We're sorry but the surround resolutions are not officially supported and at least for the time being we unfortunately don't have much time to start supporting them either: there are many things higher on the priority list at the moment. We'll have to wait and see if we can take a look at these issues in the future.
Yeah, in fact all interface-related requests seem to be low priority at the moment. :(
At least they got the FOV right... "Hardware compatibility test" was Vert-: http://www.grimrock.net/forum/viewtopic.php?f=3&t=97