A lot of luck involved in this level, but I gave you an extra point for the nice layout and choice of colours. I ended up winning in three ways and I am sure there is a fourth as well: Spoiler: Solutions 1. Ball reached the win; 2. Ball almost reached the end and B crossed over to the win; 3. B didn't make it in 2 and died in the water and R (for some reason) stepped up onto B and then to the green path to the win; and 4. (which I didn't stick around to try) is that since there is a stair block up to the win, one could potentially get the ball to stop just after the stair block and R would come up to it and turn right to the win. For that matter, there could also be a fifth way to win using an exploit such that B falls into the water and walks to the win, but it wasn't working for me. Thanks for sharing!
@nGord Thanks a lot! When i create this level, i just want to know how far that ball rolling in spiral path. And this maximum long path without ball fall into water. So, I only do solution number 1. I try your solution for this level, and I only win with solution 4. I didn't make it in 2 and 3. For solution 5, i dont know how using exploit. Thank you for your solution! Spoiler: Another Solution B standing on stone behind win spot. Waiting zapper to come. B died in the water and block R bot path. And R turn right to the stairs and win. It's similar to solution 4. For solution 4, ball must bump a little.