Our strategy for Carnival Upheaval level 8-12 is to fire the first Yellow bird through the cardboard boxes in the bottom-left, taking out one of the support boxes of the first tower. This should cause the entire left structure to collapse. Fire the next Yellow bird through the cardboard boxes of the right structure, causing it to collapse as well. If necessary, trigger the TNT in the bottom-right to reach the last marmoset. The score in the video below is 86,250.
If you have a different strategy feel free to leave a comment below; however, don't just post your score via the comments, as that's what the leaderboards are for.

103060
a. first yellow birds aim far to hit 3 stack/layer of concrete, yellow birds fall down to explode TNT, concrete to right and pig baloom explode.
when TNT explode, right tower will be destroyed and push left tower.
b.use 2nd yellow birds to hit left tower and wooden box (across 2 baloom is okay) make left tower has good crush.
Thanks for this tip, I immediately scored over 90,000 trying this way, and have 95,570 now. I’m sure that 100+ is going to be fairly easy to get.
very nice
brillant! 89380 and climbing using this method
Wicked, Leon! I got 94,570 using your method! Now I just wish to be more accurate on my aiming so that I can beat 100k+. *sigh*
Hi …I have been using the same method as Leon ,and was having trouble getting my second shot to break through the boxes ,I know use 2alternative shots that when u get the feel for do more damage ,..the first is a soft shot or half shot ,so the bird goes half way up 2 the box above with the dynamite ,that will give u a clean full boosted shot through the first horizontal bit of wood into boxes,the second 1 is quite easy after a few tries ,just shoot straight at box with dynamite above u ,and hit the booster and the yellow bird will deflect of the box in the sky and come back down at an angle hitting the front section ,the angle will vary depending on the point u hit top box ,Good luck…
Got the 104k using the same strategy. No explanation of why I suddenly got lots of points, luck as usual!
There’s a lot of that here, but not to worry, what’s important is that you got the good score with the right strat. I’m having to come here to remember how this level goes. I’m playing on my PC, but having got it on my Xoom, I forgot how to complete this level, it’s been so long.
Nice Strat Leon…just improved my score over 14K ;-)
Thanks for the tip, I’ve improved, but I see there is still a lot of room for more improvement! :)
http://youtu.be/ZZO095eSYug this is a clip of the second strat that iwas deflecting of the box ,u just have to play with the angles a bit ,the balloon was a plus lol
if, as i did, you detonate the tnt and the far right monkey is still alive, use the red bird…you cannot reach the little bugger directly, you will have to aim for the smaller black barrel thing on the left and bounce up into him. i got 79130 with that method.
Thanks! @AMG Leon