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I built 5 robots to beat the 5 most popular arcade games. If you want to unlock the magic of engineering in your life, go to http://Studio.com/Markrober (for teenagers and older) OR http://Crunchlabs.com/MarkRober (for teenagers and younger).
And if you want that backpack (minus the contraptions to win all the games), you can find it here- https://markrober.store/collections/backpacks-1
Yes that is the plants vs zombies music! Credit to the inimitable Laura Shigihara- https://www.youtube.com/supershigi