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Portal: The Flash Version Guide
Tutorial : How to beat Portal: The Flash Version – Level 15
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Engage infinite loop to gain speed, one needs it to propel oneself high.

It does not matter if you open up the Blue Portal or Yellow Portal first, as long as you have the portals lined up as illustrated above, you will have an infinite loop.

You will drop down into the Yellow Portal underneath you, come out from the ceiling through the Blue Portal, drop back down into the Yellow Portal again, come out from the ceiling through the Blue Portal again … thus effectively forming an infinite loop.
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