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874

LEGO

Mermaid Roller Coaster Ride

Name: Mermaid Roller Coaster Ride
Brand: LEGO
SKU: 42703

Reference: #42703 · released in 2026

Themes: Friends

The LEGO Mermaid Roller Coaster Ride set was released in 2026 in the Friends theme. This construction toy contains 874 parts and 5 minidolls, including Autumn, Serina, and Azuria. Kids can build a working roller coaster ride featuring a rotating pool and themed accessories.

This set from LEGO includes a total of 874 parts distributed across 256 distinct unique parts.

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874

Total parts

256

Unique parts

LEGO

Universe

Booklet 1/2 20.82 MB

Booklet 2/2 97.15 MB

Set parts (256)

874 parts in the box

Tile Round 1 x 2

Nougat

Tile Round 1 x 2 Half Circle

White

Hair Long Ponytail, Wavy, Marbled Opal Trans-Dark Pink Pattern

Opal Trans-Light Blue

Minidoll Hips and Cargo Pants with Nougat Legs, Medium Azure/White Shoes Print [Thin Hinge]

Yellow

Brick 2 x 2 Corner

Lime

Tile 1 x 4 with Groove

Bright Light Yellow

Tile Special 1 x 2 with Handle

White

Plate 2 x 12

Light Bluish Gray

Plate 2 x 12

Medium Azure

Brick Sloped Inverted 75° 2 x 1 x 3

White

Brick 1 x 2 x 5 with Hollow Studs

Medium Azure

Plate Special 1 x 2 Side Handle [Free Ends]

Pearl Gold

Hair Long with Bun

Black

Hair Curly with Thin Braid

Dark Orange

Brick 2 x 4

Tan

Brick 2 x 4

Medium Lavender

Brick 2 x 3

Light Bluish Gray

Brick 2 x 2

Medium Lavender

Brick 1 x 2

White

Brick 1 x 2

Medium Azure

Brick 1 x 2

Medium Lavender

Brick 1 x 1

Medium Lavender

Brick 2 x 10

White

Brick 2 x 8

Medium Lavender

Brick 1 x 6

Medium Azure

Brick 1 x 4

Red

Brick 1 x 4

White

Brick 1 x 4

Dark Pink

Brick 1 x 4

Medium Lavender

Plate 2 x 4

Black

Plate 2 x 4

Tan

Plate 2 x 4

Medium Lavender

Plate 2 x 3

White

Plate 2 x 2

Pearl Gold

Plate 1 x 2

Medium Lavender

Plate 1 x 2

Bright Light Yellow

Plate 1 x 2

Pearl Gold

Plate 1 x 2

Blue Violet

Plate 1 x 1

White

Plate 4 x 10

Tan

Plate 4 x 4

White

Plate 6 x 10

Medium Azure

Plate 2 x 8

Tan

Plate 2 x 8

Medium Azure

Plate 6 x 8

Tan

Brick Sloped 45° 2 x 4

Medium Lavender

Brick Sloped 45° 2 x 2

Medium Lavender

Brick Sloped 45° 2 x 1 with Bottom Pin

Medium Lavender

Brick Round 1 x 1 Open Stud

Yellow

Brick Round 1 x 1 Open Stud

Lime

Brick Round 1 x 1 Open Stud

Opal Trans-Dark Pink

Tile 2 x 2 with Groove

White

Tile 2 x 2 with Groove

Medium Azure

Tile 2 x 2 with Groove

Medium Lavender

Tile 1 x 2 with Groove

Trans-Light Blue

Tile 1 x 2 with Groove

Medium Azure

Tile 1 x 2 with Groove

Bright Light Yellow

Tile 1 x 2 with Groove

Medium Lavender

Tile 1 x 2 with '100' Banknote Print

Green

Tile 1 x 2 with Phone Screen, Bright Pink/White 'HEART LAKE PARK' Ticket, Barcode Print

Medium Lavender

Tile 1 x 2 with Photo of Liann, Autumn, Leo on Roller Coaster Print

White

Brick 1 x 2 x 2 with Inside Stud Holder

Yellow

Brick Round 2 x 2 Dome Top, Vented Stud

Tan

Plate 1 x 8

Tan

Brick 1 x 3

Tan

Plate 1 x 3

Medium Lavender

Plate 1 x 3

Bright Light Yellow

Plate Special Round 1 x 1 with Vertical Bar

White

Technic Brick 1 x 2 [1 Pin Hole]

Tan

Technic Axle 8

Black

Plate 1 x 4

White

Plate 1 x 4

Medium Lavender

Plate 1 x 4

Medium Azure

Plate 1 x 4

Dark Pink

Plate 2 x 6

Tan

Plate 2 x 6

Medium Lavender

Plate 2 x 6

Dark Pink

Plate 2 x 10

Tan

Plate 2 x 10

Dark Tan

Brick Round 2 x 2 with Axle Hole

Trans-Light Blue

Brick Round 2 x 2 with Axle Hole

Tan

Bracket 2 x 2 - 2 x 2

Light Bluish Gray

Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening)

Medium Azure

Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening)

Dark Pink

Bar Curved with Axle End and 1 x 1 Round Plate

Trans-Clear

Box 2 x 2 x 2 [Hollow Studs]

Black

Box 2 x 2 x 2 Door with Slot

Black

Technic Axle and Pin Connector Angled #7 - 168.75°

Reddish Orange

Treasure Chest Bottom with Rear Slots, No Groove

Reddish Brown

Treasure Chest Lid [Thick Hinge]

Reddish Brown

Dish 2 x 2 Inverted [Radar]

Trans-Clear

Dish 2 x 2 Inverted [Radar]

Light Bluish Gray

Plate Special Round 1 x 1 with Hollow Stud and Underside Clip

Trans-Clear

Brick Sloped 18° 2 x 1 x 2/3

Dark Blue

Ghost Effect with Bar

Bright Light Yellow

Hair Long Curly, Internal Supports

Opal Trans-Purple

Brick Curved 1 x 2 x 1 with Curved Top

White

Plant, Flower, Peony Rose with 2 Layers

Orange

Pillow Plush Toy with Narwhal, White Chest, Dark Blue Dots Print

Medium Azure

Technic Brick 1 x 1 with Pin Hole

Medium Azure

Technic Axle 3 with Stud

Dark Tan

Dome 1 x 1 x 2/3

Trans-Clear

Plate Special 2 x 2 with Bar Frame Round

Trans-Light Blue

Brick Special 1 x 2 with 1 Center Stud on 1 Side, No Bottom Stud Holder

Trans-Clear

Creature Body Part, Horn (Unicorn) with Small Pin

Pearl Gold

Plant, Leaf Weeping Willow

Opal Trans-Bright Green

Rock Boulder 2 x 2 x 2/3, Top

Opal Trans-Purple

Brick Special 1 x 2 with 2 Studs on 1 Side

Light Bluish Gray

Brick Special 1 x 2 with 2 Studs on 1 Side

Bright Pink

Plate 3 x 3

Tan

Plate Round 6 x 6 with Hole

Tan

Bracket 5 x 2 x 1 1/3 with Holes, Pin Bottom

Medium Azure

Minidoll Torso Boy with Dark Pink Jacket, Lime Collar, White Shirt with Lime Hamburger Print, Medium Nougat Arms and Hands

Medium Nougat

Brick Curved 2 x 1 No Studs [1/2 Bow]

Medium Azure

Tap 1 x 2 with Dual Handles, Small

Pearl Gold

Plate Special 1 x 2 with 5.9mm Centre Side Towball

Dark Bluish Gray

Tile Round 2 x 2 with Bottom Stud Holder

Lavender

Road Sign Clip-on 2 x 2 Square [Thick Open O Clip]

Black

Plant, Leaves, Round 2 x 2 x 2/3 with + Axle Hole and 4 Leaf Extensions

Bright Light Orange

Brick Sloped 45° 2 x 1 with 2/3 Cutout [New Version]

Medium Lavender

Tile Special 1 x 1 with Clip with Rounded Edges

Pearl Gold

Tile Special 1 x 1 with Clip with Rounded Edges

Bright Light Yellow

Minidoll Hips and Fishtail (Mermaid) with Opal-Trans Clear Tail, Metal Blue Decorations Print

Lavender

Minidoll Hips and Fishtail (Mermaid) with Opal-Trans Pink Tail, Metal Pink/Gold Decorations Print

Warm Pink

Brick Arch 1 x 8 x 2 Raised

Tan

Brick Arch 1 x 8 x 2 Raised

Medium Lavender

Brick Round 2 x 2, Pin Holes

Medium Azure

Technic Pin Connector Round 1L [Beam]

White

Plate Special Round 2 x 2 with Center Stud (Jumper Plate)

Medium Azure

Plate Special Round 2 x 2 with Center Stud (Jumper Plate)

Dark Pink

Plate Special Round 2 x 2 with Center Stud (Jumper Plate)

Lavender

Plate Special Round 2 x 2 with Center Stud (Jumper Plate)

Orange

Animal, Clam [Type 2 - Locking Edge on Inner Lip]

White

Tile Special Round 1 x 1 with Hollow Bar

Dark Pink

Brick Special 1 x 2 x 1 2/3 with 4 Studs on 1 Side

Dark Pink

Technic Axle 11

Light Bluish Gray

Panel 1 x 2 x 1 with Rounded Corners and 2 Sides

White

Plant, Flower, Plate Round 1 x 1 with 5 Petals

Bright Light Orange

Wheel Roller Coaster

Dark Bluish Gray

Vehicle Track, Roller Coaster Straight 16L

Blue Violet

Vehicle Track, Roller Coaster, Curve

Blue Violet

Vehicle Base, Roller Coaster Car 4 x 5

Bright Light Orange

Vehicle Track, Roller Coaster Ramp Large Lower Part, 6 Bricks Elevation

Blue Violet

Vehicle Track, Roller Coaster Ramp Large Upper Part, 6 Bricks Elevation

Blue Violet

Tile 2 x 3

Tan

Turntable 2 x 2 Female

White

Turntable 2 x 2 Female

Dark Orange

Tile 4 x 4 Curved, Macaroni

Bright Light Yellow

Tile 4 x 4 Curved, Macaroni

Tan

Tile 2 x 2 Curved, Macaroni

White

Brick Sloped 45° 2 x 1 with 2/3 Inverted Cutout and no stud

Medium Lavender

Minifig Head [Plain] [Vented Stud - 2 Holes]

Medium Azure

Curled Decorative Ornament / Plant Vine with Bar

Trans-Light Blue

Equipment Camera Handheld with Central Viewfinder

Black

Brick Round 2 x 2 Dome Top, Hollow Stud

Opal Trans-Dark Pink

Bar 4L (Lightsaber Blade / Wand)

Dark Azure

Wedge Plate 8 x 8 Cut Corner

Tan

Technic Brick 1 x 2 [2 Pin Holes]

Sand Green

Technic Plate 2 x 6 [5 Holes]

Light Bluish Gray

Technic Brick 1 x 2 with Axle Hole Type 1 [+ Opening] and Bottom Pin

Tan

Technic Beam 1 x 15 Thick

Bright Light Orange

Plant, Plate 1 x 1 Round with 3 Leaves

Magenta

Plate Special Round 1 x 1 with Hollow Stud and Horizontal Bar 1L

Dark Bluish Gray

Plant, Carrot

Bright Light Yellow

Plate Special 1 x 3 with 2 Studs with Groove and Inside Stud Holder (Jumper)

Medium Azure

Plate Special 2 x 2 Splat Gear, 6 Teeth

Medium Azure

Plate Special 4 x 4 Splat Gear, 10 Teeth

Medium Azure

Tile Special 1 x 3 Inverted with Center Hole

White

Plant, Beehive / Nest

Bright Pink

Minidoll Hips and Shorts with Warm Tan Legs, Coral Shoes, White Socks Print [Thin Hinge]

Bright Light Orange

Minidoll Hips and Shorts with Light Nougat Legs, Dark Blue Sandals Print

Medium Lavender

Brick Curved 1 x 2 x 1 No Studs

Medium Lavender

Plate Angled 3 x 3 with Heart Shape

Dark Pink

Brick Special 2 x 4 with 3 Axle Holes

Magenta

Hair Scruffy and Swept Right

Reddish Brown

Bracket 2 x 2 with 1 x 2 Vertical Studs

Lavender

Plate 8 x 8 with Rounded End

Tan

Door Frame 1 x 6 x 6

Lavender

Technic Axle 7

Light Bluish Gray

Rock Panel 2 x 4 x 6

Medium Lavender

Plate Special 1 x 2 [Side Handle Closed Ends]

Pearl Gold

Brick Curved 1 x 1 x 2/3 Double Curved Top, No Studs

White

Brick Curved 1 x 1 x 2/3 Double Curved Top, No Studs

Medium Azure

Animal / Plant, Coral / Sea Weed

Reddish Orange

Animal, Sea Life Set, Octopus

Vibrant Yellow

Animal, Sea Life Set, Clam Shell Large

Vibrant Yellow

Animal, Sea Life Set, Star Fish

Vibrant Yellow

Animal, Sea Life Set, Clam Shell Small

Vibrant Yellow

Animal, Sea Life Set, Fish with Bar

Vibrant Yellow

Animal, Sea Life Set, Snail with Bar

Vibrant Yellow

Animal, Sea Life Set, Seahorse with Bar

Vibrant Yellow

Helmet Round Sphere with Small Hole

Opal Trans-Light Blue

Brick Sloped 30° 1 x 1 x 2/3 with Keypad, 8 White Buttons, 1 Yellow Print

Light Bluish Gray

Technic Axle Connector Smooth [with x Hole + Orientation]

White

Plate Round 4 x 4 with Pin Hole

Medium Azure

Technic Axle 9

Yellow

Plate Special 1 x 1 with Clip Horizontal [Thick Open O Clip]

Pearl Gold

Technic Pin with Friction Ridges Lengthwise with No Center Slots

Black

Turntable 4 x 4 Square Base, Locking

White

Plate Special 8-Sided Crystal/Gem 1 x 1 x 2/3

Opal Trans-Clear

Bar, Angled with 1 x 1 Round Plate / Stud on End

Trans-Clear

Tile Round 2 x 4

Yellow

Tile Round 3 x 3

Medium Azure

Tile Round Corners 4 x 4 x 2/3

White

Technic Axle Connector Hub with 4 Bars at 90°, Reinforced Axle Hole

Dark Bluish Gray

Plate Special 2 x 2 x 2/3 with Axle Hole and Grill on Sides (Haybale)

Tan

Brick Sloped Inverted 45° 2 x 2 [Round Hollow Bottom Pin, Bar-sized Stud Holes]

Light Bluish Gray

Grille Bar 1 x 4 x 1 2/3 Bull Bar, Squared

Black

Plate Special 1 x 4 Rounded with 2 Open Studs

Light Bluish Gray

Bar 2L with Stop in Center

Red

Brick Round 4 x 4 Dome Top with Round 2 x 2 Recessed, 4 Studs

Opal Trans-Light Blue

Vehicle Track, Roller Coaster, Curve Ramp 13 x 13 x 3

Blue Violet

Door 3 x 6

Reddish Brown

Brick Special 1 x 2 x 1 2/3 with 8 Studs on 2 Sides

Trans-Clear

Plate Round 1 x 1 with Open Stud

Light Bluish Gray

Plate Round 1 x 1 with Open Stud

Trans-Light Blue

Plate Round 1 x 1 with Open Stud

Lime

Brick Special 1 x 2 with 1 Center Stud on 1 Side, Bottom Stud Holder

Medium Lavender

Tile 2 x 4 with Groove

Bright Light Yellow

Brick Special 1 x 1 with Stud on 1 Side

Tan

Brick Special 1 x 1 with Stud on 1 Side

Dark Pink

Plate Special 2 x 2 with Groove and Center Stud (Jumper)

Medium Azure

Plate Special 2 x 2 with Groove and Center Stud (Jumper)

Tan

Plate Special 1 x 2 with Bar Up [Horizontal Arm 5mm]

Dark Pink

Plate Special 10 x 10 Octagonal with Hole

Dark Tan

Technic Panel Fairing 2 x 1 x 1

White

Window 1 x 2 x 2 Castle

Light Bluish Gray

Brick Special 2 x 2 with Grooves and Axle Hole

Tan

Musical Instrument Microphone [Plain]

Black

Plate 2 x 14

Tan

Minidoll Head, Black Eyebrows, Reddish Brown Eyes, Open Mouth Smile, Dark Orange Lips Print

Warm Tan

Minidoll Head, Reddish Brown Eyebrows, Sand Blue Eyes, Coral Lips, Metal Blue Stars

Light Nougat

Minidoll Head, Dark Orange Eyebrows, Olive Green Eyes, Freckles, Nougat Lips, Worried

Light Nougat

Minidoll Head, Black Eyebrows, Reddish Brown Eyes, Gold Lips, Decorations

Sienna Brown

Minidoll Head, Thick Black Eyebrows, Reddish Brown Eyes, Smile Print

Medium Nougat

Minidoll Head, Dark Orange Eyebrows, Bright Green Eyes, Freckles Print

Light Nougat

Weapon Trident

Pearl Gold

Plate 8 x 16

Tan

Minidoll Torso Girl with Blue Violet Top, Metal Blue Sea Shells Print, Light Nougat Arms and Hands

Light Nougat

Minidoll Torso Girl with White Shirt, Dark Pink Trim, Blue/Lime/Yellow Shapes Print, Warm Tan Arms and Hands

Warm Tan

Minidoll Torso Girl with Sienna Brown Arms and Hands with Dark Pink Top, Gold Trim, Sea Shell Necklace Print

Sienna Brown

Brick Round 2 x 2 [Grill]

Pearl Gold

Panel 1 x 2 x 1 with Rounded Corners and Central Divider

Medium Azure

Brick Curved 4 x 1 Double, No Studs

White

Brick Round 3 x 4 x 2/3 Triple Curved with 2 Sunk Studs

White

Brick and Axle Separator v2.0

Orange

Tile Round 1 x 1

Trans-Clear

Tile Round 1 x 1

Trans-Light Blue

Tile Round 1 x 1

Lime

Tile Round 1 x 1

Yellow

Tile Round 1 x 1

Nougat

Brick Special 1 x 2 with Masonry Brick Profile

Tan

Tile Special 1 x 2 with Sloped Walls AKA Money / Gold Bar [Ingot]

Light Bluish Gray

Tile Special 1 x 2 with Sloped Walls AKA Money / Gold Bar [Ingot]

Pearl Gold

Minidoll Torso, Left Limb Reduction with Blue/Bright Light Blue Plaid Shirt Print, Light Nougat Arms and Hand

Light Nougat

No image

Sticker Sheet for Set 42703-1

[No Color/Any Color]

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