... my bad, solved this level not intendedly, after push a ball beside zapper, by doing redirecting R using B, causing one ball not in function. then I play it again the second time, here are the intended ways; 1. push B not to hard, to land on middle section of level... 2. B pushed by long rotating pipes. 3. B push a ball, fill a tiny hole under pipe. 4. R got frozen under bended pipe. 5. get B back to pusher, now push it hard. 6. B touch a ball at higher floor at corner. 7. press dragable hardly. 8. there will be a strange machine to help redirecting R to touch a ball beside zapper. 9. get B back to start point, finish.
@Ray Aznable The level has actually two intended solutions as description suggests. If you are able to choose the correct timing you can redirect R before it arrives in the zapper area. Otherwise, you can set it free by the descending mechanism.