Back when I was an undergrad we used to play MUDs, which were a player-extendable cross between a MMORPG and a text adventure. It was a terrible time sink, but

Back when I was an undergrad we used to play MUDs, which were a player-extendable cross between a MMORPG and a text adventure. It was a terrible time sink, but I'd always wondered if it would be a good tool for making foreign language learning more fun.