@richardfu_ The dark central hole with the rails snaking out of it serves no purpose other than being a barrier for the ball and bot.
@retrograde Sorry for being not clear, I'm referring to the tunnel between the two stairs. It looks like a ball should go into it, but I can't find a way to do it.
@richardfu_ Spoiler: Getting a ball down the ramped slot Yes, to solve this level a ball must be gotten down the ramp and into the slot. First, bring the ball by the arch around the main loop and get B-Bot onto it. Next maneuver B-Bot (on the ball) over to the stair by the arch and get B-Bot down off the ball. Place B-Bot next to the stair but keep him the main loop path. Next circle the ball back around the loop until the ball's path is blocked by B-Bot. The ball should in line with the slot now. Getting the ball into the slot is a matter jiggering with the rocking beam that both B-Bot and the ball are on. It helps to use the trick to hold down the draggable beam to get the ball spinning. Once the ball moves far enough towards the ramp B-Bot may be able to nudge it further too. Good luck!
Finished after 'jiggering' for a long time. That part felt a bit unnatural for me, but overall a good level.
I blame @cpw and @Gepeto for goading me into playing this and leaving a review. That's an hour of my sleep that I will never get back. One word: painful. At least that is one completed card that I will never delete from my phone. Good night.
