this is a very cool “kids science center online” game that also teaches basic physics. fun problem solving. i’ve played this for ridiculous amounts of time, and watched others (including my kids) get hooked and do the same.
there was only one level i couldn’t solve, but a friend solved in while i watched (one of the ones with a ton of mirrors, that is just an issue of trial and error).
(ht to bob, some time ago)