Old Castle

I'm able to get to what I think is the last move, when the

Spoiler: end of level move

ball rolls down and lands on the zapper

but now I'm stuck, I can't find a way to move forward. Is there some trick needed after this? I see this level does use some trick so I'm not sure if the end of the level calls for a trick. Or do I need to think more creatively?

Ahh I figured I was missing something there. Great level, just the right amount of puzzling. Tricks weren't overwhelming. And there was some forgiveness in the level. One annoying click to place (you know where). Really enjoyed this one!

I noticed that there were

Spoiler

two balls in the elevator

, was the original design a different ending?

Need help...

That was a very clever ending that took quite a few experiments to discover. I was expecting a second winblock so seeing the win take place was a pleasant surprise.

I don't get the ending or the win. The auto slider the last ball should roll over WILL NOT BE STOPPED. It slips on past, every time & that makes this unwinnable. How is it stopped?

The solution video is on Youtube, although I highly encourage you to try to find the solution yourself! This level is so good with clever moves. @cimarronline 's hints above were enough for me to figure out the ending, if you need more help.