I've had a long-standing rule to avoid getting involved in any sort of crowdfunded activities. I didn't donate to Shadowrun or Wasteland, but I did buy and enjoy both of them (I'm plugging both of those games right now, just so you know they're good). I haven't...
When you get stuck with what to do call on Mechanic Pig and it will instantly build the best possible vehicle for a specific puzzle. You'll still need to ferry the pig to the end of the stage while reaching the assigned goals.
You can score three Mechanic Pigs by liking Bad Piggies on Facebook. When those run out, buy more via in-app purchase:
10 Mechanic Pigs: $1.99
35 Mechanic Pigs: $5.99
65 Mechanic Pigs: $9.99