Undercroft is a free iPhone and iPod touch "old-school" style RPG originally developed and released in 2005 by Rake in Grass, an independant game developer. A PC version also existed, but was removed from markets as the game underwent various updates. In 2010, Jagex purchased Undercroft (gaining all rights to the game) and repackaged it as a free download.
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For a free mobile game, this really ruled. It was actually a pretty deep RPG that was over 20 hours. A few classes, but pretty decent combat. If you ever get a chance, you can download the Windows version here:
https://www.rakeingrass.com/games/undercroft/
https://www.rakeingrass.com/games/undercroft/