[rurp]

>I can prove there are no more busses and I'm 100% right, but I can predict 100% of the time it'll say "please try again".

I frequently run into the same issue of having correct answers rejected, and have read posts from many others who experience the same. At some point I started intentionally picking random squares for the first couple image sets. Interestingly, it doesn't seem to end up taking any more submissions overall than when I try to pick the right answers from the start.

Plus, polluting Google's free work data set ever so slightly gives me a small amount of pleasure.