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Thanks to @ridgerunner who pointed out the problems. Hopefully it's a good fix and all mechanisms work well for you guys.

Here is the walkthrough of the older version but overall gameplay is still the same.

Spoiler: Video solution

Superb level that now plays perfectly. I like the fix for the autoslider problems in first version.

@ridgerunner Thanks for playing, commenting and rating. Glad that the fix is perfect.

@mastersifu - The mechanism push caused numerous restarts as the first time R pushed it and after about 20 seconds, turned and when back up so R could continue on. I screwed up after that so restarted, the next time R didn't return - was frozen... The next time R went under the mechanism push so I needed to know which was right. None - the video showed. So B pushed it and it stopped on the two square stone blocks... The next time and last time the mechanism slowed down and almost stopped but continued to roll and finally got to the right spot - I hope as I didn't watch the video aside from seeing who pushes it.

@mastersifu - You got me on the B push and the R walk over B without stairs. I think I just wanted the level over by then as it wasn't going so smoothly and the fun disappeared. Both moves are not tricks but not normal either. I had way too many restarts well over the 50% mark in the sand/dirt end. The first one, R pushed B back up the stairs and got stuck on the dirt block. The next one was as R walked onto B and dropped the ball. I was looking to see which way B should go to drop R and R got stuck on the metal half pillar. The next time was after the R mechanism push, like in your video, R turned at the bottom of the stairs but I couldn't get R to stop so it was another lap to try again.

Excellent, long level, well thought out. Thanks for sharing @mastersifu

@mastersifu what were the fixed issues? I cannot spot a difference.

@shaun Roberts Thanks for playing, commenting and rating. Do you face any problem while playing?

@Link First, the autoslider. I changed the way the ball is pushed to trigger the mechanism push. In the previous version, one has to hold the ball by a slider, but @ridgerunner said this might causes the autoslider to stuck forever. Second, the last ball beside the sliding beam on the dirt area. Previously, the ball is supposed to nudge by R movement of walking back and forth but this was not a good move. So I added a slider beside (maybe hard to see as it is covered in the shadow) to let B nudge the ball. Of course R movement is still able to nudge it, but if it fails, then B will do it.

@Meko Guy Sorry for my late reply. Firstly, I thought it will be obvious that B should push the beam as B is already on the top floor while R is down there. If R were to push it, B will have to herd R to the lift, and it is possible that the push isn't strong enough. Don't you think it is a risky move?

I'm surprised to see this happened. Is it a fluke or it happens most of the times? I never thought that R will be strong enough to push B as I never meet this problem before.

Actually, after R pushes the ball on metal half pillar, either way is ok for R to miss B and fall. Just that one of the way requires a longer gameplay as you need to repeat the miss and fall so that B is in front of R to herd R.

There is a slider there to block R path.

@mastersifu - The mechanism push are normally R moves as the open space under will make R push all day until it moves so therefore it isn't risky but will R stay at the other end is the big question. If R goes under the mechanism or turns around then okay but not if R gets stuck. The B push will prevent R from getting stuck but if the mechanism stops on the stone block like mine did, then B can't push anymore - R could but back to maybe getting stuck again.

As for R pushing B back, it was more of a bad tap thing. Thanks to the fuzzy tap, B stopped one block short of the stairs, R had already turned and so as R walked into the low spot, I again tapped the stairs, R's long legs pushed B back causing the issue.

Good point about the slider to send R back but I was just trying to complete it at this point and wasn't thinking as good as I should have.

@Meko Guy Thanks for the explanations.

Wow! Excellent clean logic level...I had an small issue pushing some balls but the rest was really interesting... clever gameplay... Thanks for sharing @mastersifu

@delator77 Thank you very much for playing, commenting and rating. I'm glad that you enjoyed it and the issues didn't frustrate you. Thanks.

Fun and very entertaining level with lots of routes and possibilities to explore.
I did it differently and did not use two balls or have R walk cross the plank. Then looked at your video solution and did it this way too which is just as fun. Really loved the mechanism that pushed B on top of R