Uploaded February 2023 | Updated September 2026, 40 minutes ago

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Aperture Mini Scientist presents Gravi-Portal IV

Aperture Mini has been testing and testing and testing (with a little help from Junior and I). Quite how we have ended up at Grave-Portal IV, I don't know, but it probably isn't important.

PS The cake is still a lie

#marblerun #gravitrax #gravitraxfans