I used to play Brainiversity 1 and intermittently used the game to test my primary school students. It was great fun. I'm having trouble logging into my old account, so I thought might as well buy Brainiversity 2 but it's terrible. I live in Australia and the context is too North American-centric for Aussie kids (and me). Further, the user interface is not as attractive as the original version of the game.
Styrateg is a great little game, which I keep replaying every few years. The items you find in dungeons are randomly generated, so the challenge to finish within the requisite turns is a little different each time and you can choose different classes for your main character. Of particular note is the music, which is medieval, very relaxing by a group called Psalteria (I think).