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To access the yellow gun, there are many locked doors in a transparent tunnel, and the switches to unlock the doors are outside the tunnels. If I activate a switch to unlock one door, I don't have enough time to block the door before it closes.

Yellow gun and doors blocked

How can I build a timer to get enough time to block the doors? Is there a time machine?

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up vote 2 down vote accepted

You do not need to block the doors: make a "fuse" with blocks and "light" it up. Then move through the doors as they open and close one by one.

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The yellow gun can also be accessed through a different path without solving this puzzle. When you have the yellow gun, this puzzle becomes a lot easier.

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Wait, really? Where/how? – BlueRaja - Danny Pflughoeft Feb 5 '13 at 12:57
@BlueRaja-DannyPflughoeft I don't remember, to be honest. But the only way I was able to solve the "Lighting the fuse" puzzle was using the cube-moving functionality of the yellow gun. I never realized that you can solve it with the green gun by connecting the cubes before reading the answer by bartitan. – Philipp Feb 5 '13 at 13:19
Yeah, I didn't even find this way into the yellow gun chamber until after I'd found the red gun... – Tacroy Feb 5 '13 at 20:16
I found the second path; it's thru 'Link in a Chain Reaction' – BlueRaja - Danny Pflughoeft Feb 6 '13 at 14:11

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