Desktop Dungeons (iOS)I'm sure you've heard of Desktop Dungeons.
The iOS port came out last night (Android today), and it's outstanding. I am so impressed with the level of care they put into the port. Two hours in, and no crashes. No oddities. Just an outstanding game that now has touch control, which is an extremely natural way to play it.
It's $9.99 (iOS) and worth every penny.