Here’s a cool guide on XDA Developers that shows you how to run PC games on your Android device using DosBox.
Here’s a collection of small games that teach design concepts. The Bézier game in particular is great for learning how to use the pen tool in Photoshop.
Mikhail Fedosov made a cool web app that tracks historical game prices on the PlayStation store. Super handy for nabbing a deal!
Dungeon Crawl Stone Soup is an open-source, single-player, role-playing roguelike game of exploration and treasure-hunting in dungeons filled with dangerous and unfriendly monsters in a quest to rescue the mystifyingly fabulous Orb of Zot.
I’m a sucker for for retro games and Dungeon Crawl Stone Soup looks like a solid roguelike. It can also be played online via SSH and it’s open-source to boot. Win-win-win.