Played at the Ellingson home when I spent a week with them in Pendleton, OR. A cute, educational math/logic game, AND my very first exposure a party of persistent characters and permadeath. What!? Had an awesome mechanic where you could finish a screen with a subpar solution and leave some of your party behind, but at some point you had too few zoombinis to finish a puzzle. Then you could go back and start a new party and when you caught up with your first party they'd still be where you left them, and you could merge the parties together. How hardcore is that? I've been waiting for a game to do something similar ever since.

Note, there was a kickstarter to remaster this, and there's lots of info out there now.