It's a diversion
Poiser, a physics based stacking game. What makes this tricky is I don't see a pattern to predict what size box you'll get. I'll try to build a pretty solid and spread out base, then when I'm more than 50% to the top, I'll stack as quickly as I can before it topples. Kinda sloppy, but effective.
In Hedgehog Launch, buy more powerful bands, launchers, and rockets to send your hog into outer space as quickly as possible. I've played three times and have improved from 13 days to 8 days. Jason Kottke has it down to four.