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level 6 is easy shoot portals at the circles go in the arrow pointing down portal move right once you get high enough but level 7 is harder
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*Spoiler* Cayce, To beat lvl 8, start by shooting a portal to the ceiling at the very top, then shoot the opposite color on the floor directly beneath it. When you fall through you will drop fast (you could continue dropping like this forever, hence 'infinite loop'). As your dropping, shoot the same color that was on the ceiling onto the right side of the floor. You will then come out of that portal flying very high in the air. When that happens you can easily clear that huge first wall. Good Luck. :)
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Cool game. Got fed up with level 32, sorta got how to do it, but it's too long with too many hard parts to not be completely annoying.
4/5.