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Okay, I managed to solve the problem in Ancient World chamber 2-expert. Yes, it was that head-switch that changes the direction of the treadmill. It's very difficult, but can be hit using the power-shoes.

The ant-lion rushes after you after hitting the button, so you'd better be ready for a quick exit.

***Good tip: some creatures can me stunned (made immobile for a few seconds) by your light beam.

-Mobii