This app offers over 90 probability math puzzles in three levels, from beginner to advanced. The intro puzzles are straightforward but some of the puzzles will be very challenging, even for people who have studied college-level probability -- try answering them all! If you get stuck, there's a hint at the bottom of each page, and you can easily skip puzzles (and return to them later) by swiping horizontally. Have fun! This app is great practice for quantitative interviews (including quant, fina