How to get passed the first set of rolling barrels:
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It is not too difficult. You can stick to walls and ceilings by holding onto the JUMP key (SHIFT), then to let go of the ceiling or wall, you simply release the JUMP key. The image below shows Dr Goo sticking onto a piece of green vine by his head. How to get passed the Security Laser Shield: ------------------------------------------------------------------
The shield is toggled by a switch which is found directly beneath it. You need to stand on the platform where the switch is and press CTRL. This will turn the Security Laser Shield off.