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Mark Rober: Mark Rober Built a 9-Part Squirrel Obstacle Course to Guard a Walnut Vault and the Squirrels Won

Backyard Squirrel Maze 2.0 | Mark Rober Built a 9-Part Squirrel Obstacle Course to Guard a Walnut Vault and the Squirrels Won

Phat Gus was the first one through the laser maze. The self-appointed mastermind of a four-squirrel crew that had spent the better part of two days methodically dismantling a nine-part security gauntlet, she padded up to the door of Fort Knuts, the walnut vault at the end of the course, and fell for both decoy nuts on the way in. It did not matter. Her hacker colleague Marty was right behind her, and he knew exactly what to do with a safe handle. The walnuts were theirs. For anyone who has ever watched a determined animal outwit a carefully engineered system, this one lands differently, because the engineer is Mark Rober, and he spent two months planning a squirrel obstacle course specifically designed to humiliate them.

A year earlier, the squirrels had pillaged every bird feeder Rober put up. He built a first obstacle course. They defeated it handily. Version 2.0 was the response: nine challenges, two months of planning, and a build session with his friend John that Rober himself compressed into a 20-second montage. At the center of everything sat Fort Knuts, which he described as ‘the most secure walnut vault in the western United States,’ topped by a bird feeder the squirrels had been eyeing from the fence line.

The crew had been planning this the whole time

Before a single squirrel attempted the course, Rober installed cozy squirrel houses in nearby trees. A few days later, he went back for a closer look and found renovations had been made, inside and out. The interior decor had been updated. But what stopped him cold was the rest of the contents: satellite communications gear, tactical blueprints on the walls, and a miniature vault the squirrels appeared to be using to practice cracking safes. He reframed everything accordingly. This was an ‘Ocean’s 11’-style walnut heist, and the four squirrels each had a role.

Phat Gus was the mastermind. Rick was the acrobat, the gutsy one called in for anything requiring raw athletic ability. Marty was the hacker, smart but easily spooked. Frank handled logistics, had the whole course memorized, and provided blueprints. Rober introduced Rick mid-action, after slow-motion footage caught him ‘really laying himself out’ at the casino buffet, where a sedative-laced sneeze-guard situation waited for any squirrel who took more than an ounce.

The course itself escalated from a spinning twist bar to a helicopter crate that moved once weight was added, a wall of randomly shifting bricks, a hideout with a working elevator shaft and sewer crawl, a password-protected control room that lowered a ladder into the air vents above, a full vent maze, and finally the laser maze. Touch a laser beam, and a pneumatic piston slammed the door shut for one minute. Rober had placed a decoy enforcement squirrel on the roof shield above the tube, anticipating Rick’s obvious approach. Rick tried it anyway.

Two days to crack the whole thing

Within roughly two days, all four squirrels could move through the early sections at speed. Marty discovered that running fast enough through the twist bar meant it never had time to spin. Frank, after watching Rick’s laser maze attempt go sideways, took a cautious approach, then nailed it on his next try. Marty got lost in the vents repeatedly, backtracked to check the blueprints, and at one point needed Frank to physically enter the vents and coach him through. Rober noted that Marty exhibited what looked like genuine PTSD while navigating the course even after the entire system had been switched off.

When Marty finally turned the safe handle, the cargo nets inside Fort Knuts unfurled for better walnut access. Many of the squirrels, after grabbing a walnut, chose to carry it back through the entire course rather than jump off the side.

Rober was direct about the outcome: ‘Once again, I completely underestimated my adversary.’

Marty the hacker, one paw on the handle

Before pulling it open, Marty paused at the safe, looked it over carefully, and according to Rober’s read of the moment, appeared to confirm: ‘Yep, mm-hmm, yep. This is just like the schematic showed.’

After the heist, Rick buried his extra walnuts in the yard. Marty and Frank resolved whatever tension the vent coaching session had created. Phat Gus, who had started this whole thing by pillaging bird feeders a year ago, finally got extended, uncontested access to the bird feeder at the top of Fort Knuts. Almost everyone was satisfied with how it ended. The bird, Rober noted with a single chirp of audio, had a different opinion.

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