Word Warrior is a good one. It's a mashup of spelling games and an RPG, and while it's a very simple affair, there's some fun gameplay to be had here. The RPG elements are extremely streamlined (almost too much so -- the gear editor is basically just a toggle between various items that you've collected, and the choices while leveling up are slim), but the spelling challenges actually fit right up next to the monster battling. You're given a row of letters and a time limit to spell something out with them, and if you succeed, you smash the monster facing you and do some damage. If you can't spell something in time, you get damage done to you; whoever stays alive wins the loot and the XP.
There are also special letters that pop up, and using
