J's solution - 1 intercepter, 3 bits, 2 crossovers, and 17 ramps


This is my solution to #26. When you build it, pay attention to the direction of the bits

Turing Tumble home page

Turing Tumble simulator


Looks like you are missing a green ramp at the bottom center


Or he’s got one the wrong way round just up left of bottom center.