The most ambitious game I've encountered so far in the Text Adventure Literacy Jam, Barry Basic and the Quick Escape features 3 playable characters that you can switch between at will: co-ordinating their actions and making use of their individual skills is crucial to success. The titular Barry Basic has got himself stuck in a guarded building, and he needs his two friends to help get him out so they don't miss their tea-time. While Dungeon of Antur had fun RPG combat, and Sentient Beings had its cool day/night cycle, Barry Basic goes furthest in integrating it's central mechanic with almost every aspect of the game, teaching the value of teamwork while delivering a really fun and highly-polished experience. There are even achievements: I finished the game with just over half of them.