Appearances in other media
First seen jumping out at Sonic from under the bridges of Green Hill Zone, this deadly Piranha robot is back and still hungry! — Profile,
website Sonic the Hedgehog 4: Episode I
Chopper ( is recurring enemy in バタバタ Bata-Bata ) ? series. They are piranha-type Sonic the Hedgehog Badnik models created by Dr. Eggman which first appeared in . Choppers are not very menacing, but can launch surprise attacks from below bridges and water routes.
Sonic the Hedgehog (1991)
Based on piranhas, the Choppers have a red mechanical body with a white dorsal fin, pelvic fins, anal fin and fishtail. Their pelvic fins in particular are attached with blue bases. They also have serrated teeth which they flash at all times. The original models had several bolts on their body, though updated unites had a few holes in their dorsal fin as well. The originals also had black eyes with white sclera, but later designs gained cyan eyes with black sclera.
The Choppers' size has varied over the series. They have been smaller than
Sonic himself, but in and Sonic Colors they are much larger. The details of their design has also varied. In Sonic Generations , they closely resemble Sonic the Hedgehog 4 Mashers from , but in Sonic the Hedgehog 2 Sonic Colors they were menacing and had a new color scheme. In Sonic Generations though, they regained their old color scheme. Since , Choppers returned to their original design, with the addition of cyan eyes.
Sonic Lost World
Powers and abilities
In almost every game the Choppers have appeared in, they reside in pools of water under bridges where they will pop out of to bite the player. In
and Sonic Adventure 2 , Chopper arches over the bridge, while in Sonic Generations , the player can attack them with Sonic Dash Homing Attacks to cross over large gaps.
Sonic the Hedgehog (1991)
In their first appearance in the 16-bit version of
, Chopper appears in the Sonic the Hedgehog Green Hill Zone. Here, it will simply keep jumping up from under a bridge to bite the player. It is very easy to destroy.
In 8-bit version of
the game with same name, the Chopper has a slightly different appearance. It will occasionally be under a bridge or by a waterfall with a bottomless pit.
Sonic the Hedgehog 2 (8-bit)
In the 8-bit version of , Chopper-looking, unnamed Badniks appear at Sonic the Hedgehog 2 Crystal Egg Zone. Unlike their attack patterns in their first appearance, they slowly float around backwards and forwards and chomp on empty air.
They are also barely a threat to the player as they do not cross the player while running. They can be easily defeated with a
Spin Jump and do not have an organic battery like the other Badniks in the 8-bit games.
Sonic Adventure 2
Chopper as it appears in
. Sonic Adventure 2
Choppers appear in the unlockable
Green Hill Zone stage in and Sonic Adventure 2 . Instead of jumping up and down like in the original game, they jump over bridges in an arching motion. The Choppers are larger in this game.
Sonic Adventure 2: Battle
Sonic & Sega All-Stars Racing
. Sonic & Sega All-Stars Racing
, Choppers appear in two of the three Sonic & Sega All-Stars Racing Seaside Hill race courses as obstacles. Like in Sonic Adventure 2, the Chopper look larger than in their first appearance.
Sonic the Hedgehog 4: Episode I
The Chopper in
. Sonic the Hedgehog 4: Episode I
, Choppers returned as enemies in Sonic the Hedgehog 4: Episode I Splash Hill Zone. While having a more modernized appearance in this game, they usually have the same attack pattern from the first game, where they jump from pools of water at waterfalls.
Choppers appear in both the
Nintendo DS and Wii version of , where they ae encountered in the underwater sections of Sonic Colors Aquarium Park. Choppers in these games are colored pink, grey and yellow, though the concept arts relates this to Jaws. Throughout the six Acts of this Area, schools of normal-sized Choppers and very large Choppers infest the many waters that Sonic travels through.
In the Wii version, eight Choppers also appear in the underwater tunnel section in
Asteroid Coaster Act 6 and in several underwater sections in Game Land which are related to Aquarium Park and Asteroid Coaster.
Chopper as it appears in
. Sonic Generations
In both console/
PC and Nintendo 3DS versions of , Choppers can be found in Sonic Generations Green Hill and Seaside Hill. They have the same color scheme and uses the relatively same attack pattern from , though they are not powered by Sonic the Hedgehog (1991) Animals.
The Console/PC version of the game also feature
Mega Chopper that destroys the Grind Rails in a cave in an attempt to catch and defeat Modern Sonic. This Mega Chopper later reappears in Seaside Hill; if the player attempts to abuse the hydroplaning effects of the Sonic Boost and leave the Stage's boundaries, the Mega Chopper eats Sonic.
, the Choppers are featured in Sonic Dash Seaside Hill. A single Chopper can be seen jumping out of the ocean at same time the player has to jump between two routes. To proceed with the endless running, player has to jump and use the Homing Attack on the Chopper to get to the another side of the gap. If the player cannot perform the Homing Attack in time, the player may fall to the water while losing life or fail the Stage.
Sonic Lost World
Sonic attacking Choppers in
. Sonic Lost World
Choppers make another appearance in the
Wii U version of where they have their original appearance and are powered by Sonic Lost World Animals. During the game, it turns out that Badniks, Choppers included, got hijacked by the Deadly Six.
Choppers are featured in
Windy Hill Zone 1, 2, Frozen Factory Zone 1 and Sky Road Zone 1. In the 3D sections of the game, Choppers usually jump over bridges from rivers or oil lakes instead of directly attacking the player, while in 2.5D sections, they retain their attack patterns from where they jump at bridges to bite Sonic. However, their jumps are slower in this game, giving the player an easier time to destroy them with Sonic the Hedgehog (1991) Spin Jumping or the Focused Homing Attack.
In other media
Sonic the Comic
The Chopper in
. Sonic the Comic
series published by Sonic the Comic Fleetway Editions, the Choppers are a part of Dr. Robotnik's Badnik army which patrol the waters of the Green Hill Zone. Depending on the artist, the Chomper's design would differ between issues. They have also appeared on two covers and two pin-ups during the comic's run.
Adventures of Sonic the Hedgehog
The Choppers in
. Adventures of Sonic the Hedgehog
animated series, the Choppers are Badniks used by Adventures of Sonic the Hedgehog Dr. Robotnik and are entirely yellow. They made a brief in the episode " The Last Resort" where Scratch and Grounder released three Choppers on Sonic while he was water skiing, but ended up being used by Sonic to water ski.
The toy company
TOMY has released Chopper action figurine during the release of as it also includes a series of 21 Sonic figurines and these figurines came in packs of four under the Sonic & Knuckles Sonic & Knuckles label and were also released individually under a Sonic the Hedgehog label.
Chopper's Japanese name, "Bata-Bata", is the Japanese word for a clattering noise, expressing the jaw clutch noises that the Chopper often makes.
Choppers in closely resemble the Sonic the Hedgehog 4: Episode I Masher, causing many fans to believe they were said Badnik model when they were confirmed for the game.
A robot resembling a Chopper appears to chase Orbot and Cubot in the episode " Let's Play Musical Friends" in the television series .
Navigation Templates to Chopper
Sonic the Hedgehog (16-bit)
Sonic | Dr. Robotnik | Animals ( Flicky, Pocky, Pecky, Cucky, Ricky, Picky, Rocky) | Tails* | Knuckles* | Super Sonic* | Super Tails* | Super Knuckles*
Badniks Moto Bug | Buzz Bomber | Chopper | Crabmeat | Newtron | Caterkiller | Bat Brain | Roller | Spikes | Burrobot | Jaws | Orbinaut ( Unidasu, Uni Uni) | Bomb | Ball Hog
Zones Green Hill Zone | Marble Zone | Spring Yard Zone | Labyrinth Zone | Star Light Zone | Scrap Brain Zone | Final Zone | Special Stages
Egg Mobile-H | Marble Zone boss | Spring Yard Zone boss | Labyrinth Zone boss | Star Light Zone boss | Final Zone
Spin Jump | Spin Attack | Spin Dash* | Insta-Shield* | Propeller Flying* | Glide* | Climb*
Ring | Monitor ( Super Ring, Shield, Power Sneakers, Invincibility, Extra Life, S*, Flame Shield*, Aqua Shield*, Thunder Shield*) | Continue | Spring | Star Post | Bumper | Switch | Air Bubbles | Bonus Point | Signpost | Giant Ring | Capsule | Jump Stand | Up and Down | Reverse | Goal
Blue Sphere | Bomb | Chaos Emerald | Crusher | Fan | Fire Statue | Fireball Cannon | Giant spear | Debug Mode | Electric Generator | Flywheel | High-speed elevator | Conveyor Belt | Color Block | Madonna | Movable box | Rotating platform | Original Soundtrack | Promotional Comic | Shuttle loop | Sonic the Hedgehog Band ( Max, Mach, Sharps, Vector) | Seesaw | South Island | Spiked Ball | Spikes | Splats | Story Comic | Totem Pole | Winding Tunnel
*Exclusive to the
2013 re-release of . Sonic the Hedgehog
Sonic the Hedgehog (8-bit)
Sonic | Dr. Robotnik | Animals ( Flicky, Pocky, Pecky, Cucky, Ricky, Picky, Rocky)
Badniks Moto Bug | Buzz Bomber | Chopper | Crabmeat | Newtron | Caterkiller | Spikes | Burrobot | Jaws | Orbinaut ( Unidasu, Uni Uni) | Bomb | Ball Hog
Zones Green Hill Zone | Bridge Zone | Jungle Zone | Labyrinth Zone | Scrap Brain Zone | Sky Base Zone | Special Stages
Spin Attack | Spin Jump
Ring | Monitor ( Super Ring, Shield, Power Sneakers, Invincibility, Extra Life, Continue, Arrow Monitor) | Spring | Bumper | Switch | Air Bubbles | Signpost | Capsule
Bomb | Chaos Emerald | Conveyor Belt | Crusher | Electric Generator | Fire Statue | Flipper | Giant spear | Seesaw | South Island | Spiked Ball | Spikes | Teleporter | Totem pole
Sonic Adventure 2
Main article | Gallery | Beta elements | Re-releases ( Battle | 2012)
Sonic ( Super Sonic) | Tails | Knuckles | Amy* | Shadow ( Super Shadow) | Rouge | Eggman | Big*^ | Tikal* | Chaos* | Chao ( Dark Chao/ Walker*, Hero Chao, Chao Walker*, Chaos Chao) | Metal Sonic* | Gerald | Maria | President | Secretary | Sigma-Alpha 2 | Animals ( Bat, Bear, Boar, Cheetah, Condor, Dragon, Gorilla, Half Fish, Parrot, Peacock, Penguin, Phoenix, Rabbit, Raccoon, Seal, Sea Otter, Sheep, Skeleton Dog, Skunk, Tiger, Unicorn)
G.U.N troops Blue Eagle | Bomb Beetle | Bomb Wing | Gold Beetle | Gun Beetle | Gun Hawk | Gun Hunter | Gun Wing | Hornet-3 | Hornet-6 | Hornet-9 | Laser Hawk | Laser Hornet | Laser Hunter | Mono Beetle | Phoenix | Rhino Cannon | Rhino Jet | Rhino Metal | Rhino Spike | Shield Hunter | Sky Hawk | Spark Beetle | Spring Beetle
Artificial Chaos ( Artificial Chaos P-1, Artificial Chaos P-100, Cell, Float Type, Guard Type) | Badniks ( Buzz Bomber, Chopper, E-1000, Gola, Unidus, Kiki) | Boo | Boom Boo | Egg Beetle
City Escape** | Wild Canyon** | Prison Lane | Metal Harbor** | Green Forest** | Pumpkin Hill** | Mission Street** | Aquatic Mine | Route 101 | Hidden Base** | Pyramid Cave | Death Chamber | Eternal Engine** | Meteor Herd** | Crazy Gadget | Final Rush** | Iron Gate** | Dry Lagoon** | Sand Ocean** | Radical Highway** | Egg Quarters** | Lost Colony** | Weapons Bed | Security Hall** | White Jungle** | Route 280 | Sky Rail** | Mad Space | Cosmic Wall** | Final Chase** | Cannon's Core | Green Hill
Downtown Race | Grind Race | Planet Quest | Pool Quest | Deck Race | Pyramid Race
Black Market | Central City | Chao Garden ( Dark, Hero, Neutral) | Chao Kindergarten | Chao Stadium | Prison Island | Station Square | Space Colony ARK | Moon
B-3x Hot Shot | Biolizard | Dr. Eggman | Egg Golem | F-6t Big Foot | Finalhazard | King Boom Boo | Knuckles | R-1/A Flying Dog | Rouge | Shadow | Sonic | Tails
Amy Flash* | Black Shield* | Black Wave* | Booming Missile* | Bounce Attack | Captive Light* | Chaos Bind* | Chaos Control | Chaos Impact* | Chaos Screw* | Chaos Spear | Chaos Strike* | Charm Ray* | Crazy Rush* | Crouch | Dark Finish* | Dark Omochao* | Dig | Drill Claw | Drill Drive | Fire Somersault | Grind Step | Grinding | Hammer Punch* | Heaven's Justice* | Hell Bomber* | Hip Drop* | Hover | Homing Attack | Jump Dash | Kick/Kick Attack | Knuckle Spin* | Laser Missile* | Light Attack | Light Speed Dash | Lock-on | Lock-On Missile | Magic Hands | Omochao | Pick | Power Flash* | Power Laser* | Propeller Punch | Punch (Egg Walker) | Punch/Punch Attack | Rocket Launcher | Rumble Launcher* | Screw Kick | Somersault | Sonic Wind* | Speed Up* | Spin Jump | Spin Dash | Spiral Upper | Storming Heart* | Super Sonic Boost | Swim | Thunder Arrow* | Time Stop* | Volkan Cannon | Wrath of Gaia* | Zap Laser*
Level Up Items Air Necklace | Air Shoes | Ancient Light | Bazooka | Booster | Bounce Bracelet | Flame Ring | Hammer Gloves | Iron Boots | Jet Engine | Large Cannon | Laser Blaster | Light Speed Shoes | Magic Gloves | Mystic Melody | Protective Armor | Shovel Claw | Sunglasses | Treasure Scope
English voice actors
Ryan Drummond ( | Sonic) Connor Bringas ( | Tails) Scott Dreier ( | Knuckles/ GUN Soldiers) Jennifer Douillard ( | Amy Rose) David Humphrey ( | Shadow the Hedgehog) Lani Minella ( | Rouge/ Omochao) Deem Bristow ( | Doctor Eggman) Moriah Angeline ( | Maria Robotnik) Marc Biagi ( | Gerald/ GUN Soldiers) Steve Broadie ( | President) Shelly Fox (Default menu voice) | Jon St. John ( | Big) Elara Distler ( | Tikal) Tomoko Sasaki (
Japanese voice actors
Jun'ichi Kanemaru ( | Sonic) Kazuki Hayashi ( | Tails) Nobutoshi Kanna ( | Knuckles) Taeko Kawata ( | Amy) Kōji Yusa ( | Shadow) Rumi Ochiai ( | Rouge) Chikao Ōtsuka ( | Eggman ) Etsuko Kozakura ( | Omochao) Yuri Shiratori ( | Maria) Kinryū Arimoto ( | President) Shun Yashiro ( | Big) Shelly Fox (Default menu voice) | Tomoko Sasaki (
OST / Vocal Collection / Official / Sampler / 20th Anniversary /
Passion & Pride A Ghost's Pumpkin Soup | Believe In Myself | Deeper | Dive into the Mellow | E.G.G.M.A.N. | Escape from the City | Fly in the Freedom | For True Story | It Doesn't Matter | Kick the Rock! | Live and Learn | My Sweet Passion | Rhythm And Balance | Space Trip Steps | Supporting Me | The Supernatural | Throw It All Away | Unknown from M.E. | Vengeance is Mine
Angel Island | Ancient Ruin | Auto Running | Ball Switch ( Gravity Control Switch, Hourglass, Time Stop Switch) | Bomb | Bungie Vine | Chao Adventure^ | Chao Adventure 2^ | Chao Eggs | Chao in Space | Chao Key | Chao Machine | Chao Transporter^ | Chao World | Chaos Emerald | Chaos Drive | Container ( Cage) | Corkscrew loop | Cyclone | Dash Panel | Dreamcast | Dynamite | Eclipse Cannon | Eggwalker | Emblem | Emerald Radar | Emerald Shard | GameCube | Gerald Robotnik's diary | Goal Ring | Green energy fluid | Grind Rail | GUN Military Truck | High-speed warp tube | Health Gauge | Hi-Speed Shoes | Hint Box | Item Box ( Bomb, Extra Life, Health, Invincibility, Magnetic Barrier, Power Sneakers, Shield, Super Ring) | Kart Race | Key Stone ( Gate Key) | Laser Field Block | Meteorite | Missile | Outfit | Pipe | Project Shadow | Propeller Spring | Pulley | Rank | Ramp | Ring | Rocket | Safe | Shuttle loop | Snowboard | Spinning drum | Swing Bar | Teleporter | Totem Pole | Turtle | Warp Hole | Warp Wall | Weight | Wide Spring | Winding Tunnel
*Appears or is playable only in the 2P mode
**Stage is also playable in 2P mode ^ Dreamcast version of Sonic Adventure 2 only
Sonic the Hedgehog 4: Episode II
Sonic | Tails | Animals ( Flicky, Pocky, Pecky, Cucky, Picky) | Dr. Eggman | Metal Sonic
Asteron | Balkiry | Batbot | Bubbles | Burrobot | Buzzer | Chop Chop | Chopper | Clucker | Crawl | Flamer | Fullboar | Jaws | Mantis | Moto Bug | Newtron | Orbinaut ( Uni Uni, Unidasu) | Sandworm | Scarabesque | Shellcracker | Slicer | Snowy | Spikes | Steelion | Turtloids | Zoomer
Episode II Zones Sylvania Castle Zone | White Park Zone | Oil Desert Zone | Sky Fortress Zone | Death Egg mk.II Zone | Special Stages
Episode Metal Acts
Mad Gear Zone | Lost Labyrinth Zone | Casino Street Zone | Splash Hill Zone
Egg Serpentleaf | Metal Sonic | Egg Scrap Mech | Metal Carrier | Metal Sonic and Egg Mobile | Metal Sonic (race) | Egg Heart
Copter Combo | Propeller Flying | Homing Attack | Rolling Combo | Spin Attack | Spin Dash | Spin Jump | Submarine Combo | Tornado Boost
Air Bubbles | Bumper | Capsule | Booster | Chaos Emerald | Flipper | Giant Ring | Monitor ( Super Ring, Shield, Power Sneakers, Invincibility, Extra Life, Special Combination, Combination Dash) | Ring | Spring | Star Post | Red Star Ring | Spikes | Switch | Signpost | Zip Line
Conveyor Belt | Crusher | Death Egg mk.II | Fan | Flip Platform | Little Planet | Level Select | Lost Labyrinth treasure | Platform-raising Wheel | Original Soundtrack ( & Episode I) | Strange Relief | Ring Shooter | Stardust Speedway | Shuttle loop | Tails' rocket | Time Attack | Tornado | Totem pole
Sonic Lost World
Main article | Gallery | Re-releases ( PC)
Sonic ( Super Sonic) | Tails | Dr. Eggman | Orbot | Cubot | Knuckles | Amy | Deadly Six ( Zavok, Zazz, Zomom, Master Zik, Zeena, Zor) | Yacker* | Animals ( Flicky, Picky, Cucky, Pecky, Ricky, Rocky) | Omochao* | NiGHTS^ | Yoshi^
Stages Windy Hill | Desert Ruins | Tropical Coast | Frozen Factory | Silent Forest | Sky Road | Lava Mountain | Hidden World* | Special Stage** | Nightmare Zone^ | Yoshi's Island Zone^ | The Legend of Zelda Zone^ | Circus*
Badniks Antlion | Antlion Mother* | Anton* | Aquis* | Balkiry | Ball Hog* | Bat Brain | BFB* | Bladed Spinner** | Blowfish Transporter | Blaster* | Bomb* | Boo* | Boom Boo* | Burrobot* | Buzz Bomber | Caterkiller | Chopper* | Clucker | Cluckoid* | Coconuts* | Crabmeat* | Crawl | Crawlton | Dragonfly* | Dung Beetle* | Egg Pawn | Electro Spinner** | Galaga Beecar* | Galaga Beegar* | Galaga Beenor* | Galaga Beespe* | Gohla | Grabber | Gustav Turtle | Jaws | Laser Grabber* | Madmole* | Manbou* | Manta* | Moto Bug | Mushmeanie* | Nebula* | Newtron | Octus* | Orbinaut ( Uni Uni, Unidasu) | Pata-Bata* | Penguinator | Sandworm | Slicer | Snale Blaster* | Spiker* | Spikes* | Sprinkler* | Tarantula* | Tonber* | Turtloids* | Utsubo*
Baku Baku* | Cactus | Sandworm | Sheep* | Surprise Crocodile* | Yeti*
Zazz | Zomom | Master Zik | Zeena | Zor | Zavok | Deadly Six | Eggrobo
Parkour Somersault Kick** | Wall Climb** | Wall Jump** | Wall Run | Vault Dash*
Bound Jump** | Charged Dash** | Double Jump | Flying Kick* | Grinding | Run | Sky Dive | Spin Dash | Spin Jump
Wisps White* | Cyan | Yellow | Indigo | Crimson* | Magenta* | Green* | Black*^ | Red** | Ivory** | Gray**
Color Powers Cyan Laser | Yellow Drill | Indigo Asteroid | Crimson Eagle* | Magenta Rhythm* | Green Hover* | Black Bomb*^ | Red Burst** | Ivory Lightning** | Gray Quake**
RC Vehicles Helicopter RC Vehicle | Fighter Jet RC Vehicle | Stealth Jet RC Vehicle | Hovercraft RC Vehicle | UFO RC Vehicle | Balloon RC Vehicle | Omochao RC Vehicle
** Materials Green Material** | Yellow Material** | Blue Material** | White Material** | Iron Material** | Black Material** | Red Material** | Bronze Material** | Silver Material** | Gold Material**
English voice actors
Roger Craig Smith ( | Sonic) Mike Pollock ( | Eggman) Kate Higgins ( | Tails) Travis Willingham ( | Knuckles, Zavok) Cindy Robinson ( | Amy) Kirk Thornton ( | Orbot, Master Zik) Wally Wingert ( | Cubot) Liam O'Brien ( | Zazz) Patrick Seitz ( | Zomom) Stephanie Sheh ( | Zeena) Sam Riegel (
Japanese voice actors
Junichi Kanemaru ( | Sonic) Chikao Ōtsuka ( | Eggman) Ryo Hirohashi ( | Tails) Nobutoshi Kanna ( | Knuckles) Taeko Kawata ( | Amy) Mitsuo Iwata ( | Orbot) Wataru Takagi ( | Cubot) Jōji Nakata ( | Zavok) Yutaka Aoyama ( | Zazz) Yumi Tōma ( | Zeena) Mugihito ( | Master Zik) Chafūrin ( | Zomom) Yūki Tai (
Air Bubbles** | Apple | Aqua Shield** | Archie Sonic Halloween Comic Fest 2013 | Asteroid Ring | Auto Running* | Balloon* | Bound bell* | Billiard Ball | Bingo | Bonus Point | Cacophonic Conch | Cage | Cannon* | Casino Token* | Chaos Emerald | Cloud | Coconut* | Conveyor Belt* | Countdown Number* | Dash Panel | Dash Rail | Dash Ring | Extractor | Flame Shield* | Flipper | Flower Cannon | Flywheel** | Freezing Machine** | Havok | Health Gauge** | High-speed warp tube* | Hint Ring | Lost Hex | Metal nut* | Miles Electric | Minecart | Moon Mech | Music Note | Pinball Shooter* | Planetoid Spring* | Prism | Rank** | Ring | Roboticization | Seesaw | Script | Slot Machine* | Snowball | Snowball Sonic* | Sphere** | Spring | Tails' Lab** | Thunder Shield* | Time Attack* | Time Stop | Totem Pole | Truffle Cannon* | Virtual Hedgehog* | Windmill* | Wisp Away* | Wisp Gauge | | Without Boundaries: Sonic Lost World Original Soundtrack Zeti
"*" Exclusively to
Wii U version "**" Exclusive to Nintendo 3DS version "^" Exclusive to the Wii U version and downloadable content.
Sonic | Tails | Knuckles | Dr. Eggman | Animals ( Flicky, Pecky, Pocky, Rat)
Zones Green Hill Zone | Studiopolis Zone
Bat Brain | Buzz Bomber | Chopper | Crabmeat | Moto Bug | Newtron
Drop Dash | Spin Dash | Spin Attack | Spin Jump
Gimmicks and obstacles
Bumper | Goal Plate | Spikes | Spring | Star Post
Giant Ring | Item Box ( Aqua Shield, Combine Ring, Eggman Mark, Flame Shield, Invincibility, Power Sneakers, Shield, Super Ring, Thunder Shield) | Ring
Shuttle loop | Winding Tunnel