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This is a LEGO GBC (Great ball contraption) that is based off the game Portal. The balls are loaded into the contraption and are rolled one at a time into a portal on the floor. At the exact same time the ball comes out from the portal on the ceiling. It uses Mindstorms and has way too many pieces; yet here it is on LEGO Ideas for your enjoyment.
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Also check out my other projects here: https://ideas.lego.com/profile/JoshDaVidman/projects