Hi, my kid (9 yo) is loving the Turing tumble and wanted to share their solution to problem 25.
Something they like about this solution is: the ramps in the middle make a smiley face 
What they noticed is the number of balls that drop is N+1 where N is the integer that the bits represent. On the left we have 5 so it drops 6 blue; on the right we have 2 so it drops 3 red before terminating.