Here are some hints. I would suggest only peeking at the next one if you get stuck. The level is solvable with the free camera off, but it's easier with it on. Spoiler: Hint #1 Push the slider in with some force to make a black ball appear. Spoiler: Hint #2 There is more than one black ball. Spoiler: Hint #3 You need to get a black ball on each side of the slider. Spoiler: Hint #4 To get the first black ball into position you need to push the slider in hard to make it leap over the draggable block. Spoiler: Hint #5 Get 4 balls in between the draggable block and the hill. Spoiler: Hint #6 Getting the 2 black balls in place first is critical before moving the white balls. Spoiler: Hint #7 Once you have 4 balls in the tray, put the bot on the ball closest to the hill then gently push the slider in. v1.1 fixes an unintended win shortcut found by Mr. Fu.
Very clever! I completed it without hints too, turns out in a slightly different way... Spoiler I only managed to get 3 balls above the slider (and one below), but with B on the topmost ball, I managed to throw him up the chute a few times before tapping him onto the ledge at the foot of the final stairs. Great fun - thanks!
Brilliant! Except for the invisible balls. So much fun getting the balls to behave. I batted a couple right out of play. Think I have another keeper.