I think you guys are talking about Enviro-Bear 2000. Which had a lot more work on it before release, it was also an entrant and winner of a TIGSource month long competition. [0]

As for time constrained game challenges, the Klik of the Month Klub[1] gives 2 hours and 0 Hour Jam[2] gives participants just 1.

I did KotM a while back and was pretty surprised at how much I managed to get done. [3]

[0] http://forums.tigsource.com/index.php?topic=4964.0 [1] http://www.glorioustrainwrecks.com/node/44 [2] http://0hgame.eu [3] http://joeba.in/klik53/