Puzzle 19 - 18 Parts


#1

Here below is a solution using 18 parts.
This solution is not the most efficient as it may lead to multiple red loops to trigger the interception.
However, there is no output constraint, and it uses ‘only’ 4 blue balls and 6 red balls to test the 4 configurations.

Here is the link: https://www.lodev.org/jstumble/?board=rlerlf0ferrfe0lfrlfexferlfexferreei