i just played the trial and advanced thru the levels -- it shows 40. but i have to tell you that i got thru 1/3 of those 40 levels in the trial. that was reading everything and taking my time looking around.
even at 2.99, this would be a stretch. some of the "levels" passed in the blink of an eye. the one challenge was the spot the differences in the park. it was 3 scenes instead of 2 to compare and each difference was red-circled so the circles quickly overwhelmed the pictures making spotting the last 3 differences very challenging. of course the last 3 were the least obvious ones (in my opinion of course), so i actually had to use hints on them.
no slow play, no tech difficulties, but not much to make me even think about buying it either.