Sorry, I misread your post.
Okay, the boulder left, metal box above blue sphere, cross the stop button, step onto ice when the yellow hits the conveyor, blue right, box down, boulder right, step off conveyor, box acts as a blocker, yellow right and get back on the stop button, do the same with the boulder. When the waterhole is filled, push box all the way right onto the conveyor, step on conveyor, land on yellow button and wait there for a few beats. Remember to push one blue sphere when the other is moving.
Hope that helps.
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