I found and signed up for Telehack a few months back, but have not done too much with it. FriAM-ers may also enjoy the Super Dimension Fortress <http://sdf.org/>, which despite the name is less gamelike than Telehack. Of course, if you want something less expansive, there is always hackertyper.net (for when you want the appearance of terminal-fu without having to learn anything) and Jurassic Systems <http://jurassicsystems.com>(for when you know this, because it is a Unix system).
Why I like CLIs is that, when they are well-designed, they get out of your way much more than the best GUIs do. -Arlo James Barnes
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