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Non-Portal Acid Trip

Take an acid trip without portals. Those blue and orange bastards are bad for you.

NOTE: I don't know why I bothered putting in that swapping panel near the start. I realised that you couldn't get to it, so put a portalable surface where the cube is then realised you didn't need it, but I couldn't be arsed to get rid of it. Just ignore it, unless you have some weird need to go back to the start or something.