You can only enter it through the way the green arrow is facing.
Comments
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xCreeperBombx: I know, but I wanted it to be indestructible. I also wanted you to be able to go through the other way by putting one stickman in the detector, and making the other stickman walk through.
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Actually, stick figures are really buggy so if you slam your face hard enough, you can go the other way. Non-stick elements should work with this, though, assuming they're going one-at-a time. Try making a one-way with PIPE.