Day 15 of the Gadget Car Triacontathlon is when the final 13 (the half-way mark) hoverboard over several buildings in Rainbowville.
Opening Comic[]
Yellow, which was in Blue's Lab along with Blue himself, was reading a book about Marble Siege 3. He notices Blue, who was building hoverboards. It was revealed that they were safe via onboard sensors. Orange also notices Blue, but is not seen onscreen.
The Violet Controversy (Again)[]
Due to fans disagreeing with Olive's elimination, Violet and Olive swapped places again. All the contestants present when Violet was eliminated participated in another marble race; the higher their COBEN, the more marbles they got. Eventually, Pink was eliminated and switched with Violet.
Mini-Siege[]
MarbleBot, one of Blue's prototype inventions, accidentally thawed out, resulting in a long mini-siege.
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| Gadget Car Triacontathlon | Race to the Bowl • BMX Cycling • Marble Race • Dodge-Sword • Lava Escape • Ice Skating • Relay Race • Sandstorm Driving • Volcano Escape • Hydroball • Tree Flying • Castle Siege • Desk Wars • Pheesh Catching • Hoverboarding |
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