Under rating threshold (hideshow)
If you have it, use magnified and go around the rim of the cloud until you find it, if you don't, still go around the rim of the cloud thats on the left (This is for 20, its not that hard)
Under rating threshold (hideshow)
lvl 20, follow the outline of the tree on the left of the paining on the left until you find the 1 pixel that's different (and clickable). You must click the 4 obvious differences first.
Under rating threshold (hideshow)
OMG lol Kiroto is correct. Search pixel by pixel OR just randomly move your mouse in the tree thing and look out for the cursor change.
Under rating threshold (hideshow)
ITS THE CLOUD CLICK THE LEFT CLOUND ON LEVEL 20!!!!!! this if for people who are having diffuculties (bad wording for me)