The main idea of brain teasers is good. The thing is though, each teaser or joke is sloppy and has SEVERAL mistakes in each, making it hard to understand.
I also would NOT recommend this app for children. Some of these teasers include math, and since the answer is different then you would guess, I think it would damage their math skills. Such as one similar to this- "How many time can you take 2 from 200" (error intended) Normally one would think "100" but then the answer was "1, because then it becomes 198"
Sorry, but I do not appreciate the sloppiness or stupidity of this app. Please put a little more effort into it next time.