Me and My cousin beat it in a day. Its the best game i've played in a long time. We have over 85% on each level, and most of them are 100%'s. We did the multiplayer ones (Including the x4) that we found, so we have basically everything. We just need to re-do the levels that we don't have because most of the reasons were because we didn't have the right stickers for the sticker switches.
Also, If you play people's levels that they have made, Sometimes they give you stuff that they made in the level. There is this one level that is really, really hard. I don't remeber the make of it, but it is like something castle, or ninja warrior...Something. All I know is that it is hard and there is a scarecrow type thing at the beginning with a tiger face on it oo;
I was in the middle of making a Up-right walking machine when i had to go. I have the cockpit and one leg made. Other things i have made is a bird that you can actually control, and a motocycle that has a huge knife on the front of it, like a bayonet.