Level 51
Put the cart on the left platform above the conveyor belt, then set up the eyeball under the entry hatch so that it rolls left.
Alternative solution
Yashar Kamyar also sent in this better solution:
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Put the cart on the left platform above the conveyor belt, then set up the eyeball under the entry hatch so that it rolls left.
Yashar Kamyar also sent in this better solution: