Got stuck on the "up" stage. I can get about half of the box into the goal, but it apparently doesn't count.

^which level, as there are several with the word "up" in them.
reach up, up the hump or full up. I've cleared all three so let me know and I'll tell you how i did it. what i like is that there are so many different ways one can actually complete a level.

so far I've hacked together contraptions that barely make the grade. I went to the forums to see what other people were talking about and found that they post the save game of how they completed each level. Holy Crap. people are making wicked advanced things. Talk about over achievers :-) this user built and threw a basket to the final destination, then catapulted the ball into it... amazing... check it out
http://fantasticcontraption.com/?designId=2775825

nibiyabi: you mean "the tube" level? it's easy once you get the right idea. truly fantastic game, I still play it from time to time

*quality

I always wind up building a very simple design like a rover or a bridge and a rover. Maybe it's just my line of work, but simplicity is always better in my book.
Spoiler ideas for a few I liked:
http://FantasticContraption.com/?designId=4978544
http://FantasticContraption.com/?designId=4978659
http://FantasticContraption.com/?designId=4978373

I hadn't realized to that point that you can attach things directly to the red block/ball. lol. I was always carrying it.

Ok, one more:
http://FantasticContraption.com/?designId=4978984

Awarding qruel with one star point for this contribution to Sift Talk - declared quality by Doc_M.

Curse you Qruel. I'm stuck on "Handling" and it's freaking 4 am. doggonit. My roommate's light is also on. I introduced him to this today. mwahahaha.

heh im not as creative as I thought...

Ugh, I was stuck on Four Balls for hours until I realised you don't always have to attach rods to wheels.

4 balls:
http://FantasticContraption.com/?designId=4979661

>> ^Doc_M:
quality
I always wind up building a very simple design like a rover or a bridge and a rover. Maybe it's just my line of work, but simplicity is always better in my book.
Spoiler ideas for a few I liked:
http://FantasticContraption.com/?designId=4978544
http://FantasticContraption.com/?designId=4978659
http://FantasticContraption.com/?designId=4978373
I hadn't realized to that point that you can attach things directly to the red block/ball. lol. I was always carrying it.
Ok, one more:
http://FantasticContraption.com/?designId=4978984


That second one is exactly what I did.

One of my personal favorites: http://FantasticContraption.com/?designId=5001902
I crack myself up sometimes.

^that was great. i didn't think it was gonna make it at first.

My internet service was out yesterday while they installed at&t Uverse. I was have withdrawls... luckily this post appeared on digg and now I'll never have to do without my online flash games

How To Download and Play Flash Games Offline
http://www.makeuseof.com/tag/download-play-flash-games-offline/

This is a frustrating game. Even now I've completed all the levels, I feel I should have completed them better, with fewer pieces and more elegant concepts.