Mark Rober's CrunchLabs : Episode 21

It's five against one when Dude Perfect challenges Mark to an epic robot showdown that's full of surprises. The only rule is... there are no rules.

Mark builds robots to beat the five most common arcade games, shares secret strategies to win tons of tickets and exposes some of the biggest scams.

After spending six months studying Jell-O, Mark sets out to fill an entire pool with it so he can see what it would be like to do a Jell-O belly flop.

Mark challenges his pet octopus Sashimi to a nine-part underwater obstacle course that tests her amazing intelligence and incredible dexterity.

"Mark starts out with a plan to drop an egg from the world's tallest building but shifts gears to attempt the world's largest egg drop... from space.

Learn the science behind some of the coolest CrunchLabs creations, from a room-temperature ice rink to a rock, paper, scissors robot that can't lose.

In a scientific face-off, Mark goes head-to-head with NileRed and Kevin the Backyard Scientist to find out which is more destructive: acid or lava.

To stop the sneaky squirrels from raiding his bird feeder, Mark builds a challenging eight-part obstacle course in his backyard to try and slow them down.

Mark throws an epic birthday party for a deserving teen, complete with record-breaking devil's toothpaste experiment - the first of its kind.

Step right up and learn which carnival games are actually winnable and which ones aren't, courtesy of Mark... and a friend from the New York Mets.

Mark's robot Dom is really good at setting up dominos. But can he fill a warehouse with a mural made up od more than 100,000 of them in just 24 hours?

Mark has 30 minutes to find all nine product designers hidden inside the CrunchLabs warehouse - and they're allowed to fight back with blasters!

In honor of the historic Perseverance Mars rover landing, Mark talks to some of his old friends at NASA and suits up to see the actual rover up close.

What's the most destructive substance on Earth? Lava's the reigning champ - but how do lasers stack up? Mark and his friends are about to find out.

Mark ups his backyard obstacle course game to keep four thieving squirrels away from a bank vault full of birdseed and a lifetime supply of walnuts.

With the right amount of forced air, a hot tub filled with sand can look like a bubbling pot of soup. But how? Mark breaks down the science behind it.

Mark uses the magic of engineering to level the playing field in a stacked competition against the world's greatest wiffle ball players.

Mark explores the possibilities of anti-drone defense technologies with a crew of backyard YouTube engineers... and the world's largest vortex cannon.

Stolen packages? Not so fast. Mark builds the original "Glitter Bomb" trap to combat porch pirates-and really make them regret their life choices.

It's not just the Ninja Kidz - it's the whole Ninja Fam! And Mark's challenging them all to a silly series of "Minute to Win It" style challenges.

CrunchLabs product designers get 24 hours to build and race their own custom go-karts incorporating engineering know-how-and the element of surprise.