Chris Dahlen at Unwinnable informs us that Lego's Heroica games are designed to be hackable.
First you need to assemble the board and the pieces and then you play – and once you’ve played, you’re encouraged to change the game by rearranging the board, making up new rule and rebalancing the scoring. The manual even gives you practical tips: Take chances. Fail fast. Change one thing, test it out and see if it makes the game more fun. As a graduate of Marc LeBlanc’s two-day game design workshop, I admired how the team at Lego had pared down an entire practice into language that small kids could understand.
I played one of these games with my nephew a while back and was charmed by the mechanic it included of having you rebuild the die during the game (because Lego!) but didn't catch on to this aspect. Very cool.