Name: LEGO Mermaid Roller Coaster Ride 42703
Brand: Lego
SKU: 42703
Price: 109.99 USD
Availability: InStock

A wide view of the LEGO Friends 42703 Mermaid Roller Coaster set, featuring purple tracks, an elaborate rock structure, a shell stage, and several minifigures on the ride. A glowing jellyfish is on the left.

Track Weaves Through Coral

The vibrant purple track of the LEGO Friends 42703 Mermaid Roller Coaster cuts through an undersea landscape. This 864-piece marvel provides an immersive ride, expertly integrating SNOT techniques for seamless rockwork and coral formations. The entire structure feels truly organic, ready for Heartlake City residents to explore.

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Set # 42703

Released 2026

Pieces 864

Price / Piece 12.7¢

Figures 5

Age 8+

Scale & Brick Value Piece Volume & Pricing Ranks

Piece Rank #377 Top 25% active

Ranked #377 by piece count against 1,543 currently available retail sets.

Historic Scale #1,233 Top 7% of 20,150

Historical ranking across 20,150 cataloged releases since 1949.

Part Efficiency #1,240 12.9¢/pc • Top 81%

Price-per-piece efficiency rank based on official retail MSRP (12.9¢/piece).

Collector Insights Verified Oct 11, 2026

Includes 11 exclusive molds and 43 rare elements recorded across official inventories.

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Categories: Fairground & Theme Parks Roller Coasters

Set 42703 Build Specifications & Overview

Complete build timeline, spatial dimensions, and display footprint analysis.

Value Breakdown

Est. Build Time (*Pieces per minute): Casual 7.1h 2 ppm*

AFOL (Avg) 3.6h 4 ppm*

Master Builder 2h 7 ppm*
Avg Price / Hour: $30.55/hr
Price Per Basic Brick: $0.06

Highly valuable! 32% cheaper than average LEGO sets.

Display Dimensions

Height 7.5 in (19.1 cm) 19 Bricks + 2 Plates high

Width 20.5 in (52.1 cm) 65 Studs wide

Depth 11 in (27.9 cm) 35 Studs deep

Display Footprint 225.5 sq in (1454.8 sq cm) 65 × 35 Studs

The Scale Check

Height equivalent to approx 4.8 minifigures stacked.

Display Fit

Oversized: Requires Deep Tabletop Surface

Building Instructions

Download or view the official PDF

Set 42703 Minifigures & Parts Manifest

Complete verified inventory of all 0 character and 864 pieces, featuring 8 exclusive parts.

Part Categories

Discover the structural DNA and the exact piece types included in this box.

Standard 454 pcs (52.5%)

Greebles 1x1 140 pcs (16.2%)

Translucent 80 pcs (9.3%)

Slopes Wedges 67 pcs (7.8%)

Bricks Special 61 pcs (7.1%)

Technic 33 pcs (3.8%)

S N O T 13 pcs (1.5%)

Equipment 5 pcs (0.6%)

Rare & Exclusive Minifigures

Complete inventory of characters and figures included in this set.

Includes 5 Mini-dolls:

Exclusive Mini-dolls 3
Autumn (fig-017812)
Azurea (fig-017813)
Serina (fig-017814)

Rare Mini-dolls 2
Liann - White Top (fig-015756)
• Seen in 3 sets ( 42645, 42659 )
Leo - Dark Pink Jacket (fig-015762)
• Seen in 3 sets ( 42650, 42652 )

Includes 16 Animals:

Rare Animals 15
Animal / Plant, Coral / Sea Weed (4x) (49577)
• Seen in 3 sets ( 10366, 11386 )
Animal, Sea Life Set, Octopus (49595a)
• Seen in 2 sets ( 11204 )
Animal, Sea Life Set, Clam Shell Large (49595b)
• Seen in 2 sets ( 11204 )
Animal, Sea Life Set, Star Fish (2x) (49595c)
• Seen in 2 sets ( 11204 )
Animal, Sea Life Set, Clam Shell Small (49595d)
• Seen in 2 sets ( 11204 )
Animal, Sea Life Set, Fish with Bar (2x) (49595e)
• Seen in 2 sets ( 11204 )
Animal, Sea Life Set, Snail with Bar (2x) (49595f)
• Seen in 2 sets ( 11204 )
Animal, Sea Life Set, Seahorse with Bar (2x) (49595g)
• Seen in 2 sets ( 11204 )

Common Animals 1
Animal, Clam [Type 2 - Locking Edge on Inner Lip] (18866)
• Seen in 32 sets

Rare & Exclusive Parts

Track this build's most elusive bricks and their production history.

Exclusive Parts 8 pieces
Bright Light Orange Vehicle Base, Roller Coaster Car 4 x 5 (SKU: 26021)
Blue Violet Vehicle Track, Roller Coaster Ramp Large Lower Part, 6 Bricks Elevation (SKU: 26559)
Blue Violet Vehicle Track, Roller Coaster Ramp Large Upper Part, 6 Bricks Elevation (SKU: 26560)
White Tile 1 x 2 with Photo of Liann, Autumn, Leo on Roller Coaster Print (SKU: 3069bpr0272)
Medium Lavender Rock Panel 2 x 4 x 6 (SKU: 47847)
Medium Azure Tile Round 3 x 3 (SKU: 67095)
Opal Trans-Bright Green Plant, Leaf Weeping Willow (SKU: 7741)
Light Nougat Minidoll Head, Dark Orange Eyebrows, Olive Green Eyes, Freckles, Nougat Lips, Worried (SKU: 92198pr0148)

Rare Parts 26 pieces
Nougat Tile Round 1 x 2 (SKU: 1126)
• Seen in 2 sets ( 21376 )
Blue Violet Vehicle Track, Roller Coaster Straight 16L (SKU: 25059)
• Seen in 2 sets ( 77082 )
Blue Violet Vehicle Track, Roller Coaster, Curve (SKU: 25061)
• Seen in 2 sets ( 77082 )
Medium Lavender Brick 2 x 8 (SKU: 3007)
• Seen in 2 sets ( 21264 )
Vibrant Yellow Animal, Sea Life Set, Octopus (SKU: 49595a)
• Seen in 2 sets ( 11204 )
Vibrant Yellow Animal, Sea Life Set, Clam Shell Large (SKU: 49595b)
• Seen in 2 sets ( 11204 )
Vibrant Yellow Animal, Sea Life Set, Star Fish (SKU: 49595c)
• Seen in 2 sets ( 11204 )
Vibrant Yellow Animal, Sea Life Set, Clam Shell Small (SKU: 49595d)
• Seen in 2 sets ( 11204 )
Vibrant Yellow Animal, Sea Life Set, Fish with Bar (SKU: 49595e)
• Seen in 2 sets ( 11204 )
Vibrant Yellow Animal, Sea Life Set, Snail with Bar (SKU: 49595f)
• Seen in 2 sets ( 11204 )
Vibrant Yellow Animal, Sea Life Set, Seahorse with Bar (SKU: 49595g)
• Seen in 2 sets ( 11204 )
Bright Light Yellow Ghost Effect with Bar (SKU: 5500)
• Seen in 2 sets ( 10366 )
Medium Azure Pillow Plush Toy with Narwhal, White Chest, Dark Blue Dots Print (SKU: 6330pr0014)
• Seen in 2 sets ( 42700 )
Blue Violet Vehicle Track, Roller Coaster, Curve Ramp 13 x 13 x 3 (SKU: 80566)
• Seen in 2 sets ( 77082 )
Opal Trans-Purple Rock Boulder 2 x 2 x 2/3, Top (SKU: 8079)
• Seen in 2 sets ( 42693 )
Medium Lavender Brick Sloped 45° 2 x 1 with 2/3 Cutout [New Version] (SKU: 15672)
• Seen in 3 sets ( 43287, 43306 )
Medium Lavender Brick Arch 1 x 8 x 2 Raised (SKU: 16577)
• Seen in 3 sets ( 10787, 11205 )
Medium Azure Brick Round 2 x 2, Pin Holes (SKU: 17485)
• Seen in 3 sets ( 43284, 43303 )
Medium Lavender Brick Sloped 45° 2 x 1 with 2/3 Inverted Cutout and no stud (SKU: 28192)
• Seen in 3 sets ( 43257, 43287 )
Medium Azure Minifig Head [Plain] [Vented Stud - 2 Holes] (SKU: 28621)
• Seen in 3 sets ( 42604, 43018 )
Medium Lavender Tile 1 x 2 with Phone Screen, Bright Pink/White 'HEART LAKE PARK' Ticket, Barcode Print (SKU: 3069bpr0268)
• Seen in 3 sets ( 42700, 42702 )
Bright Light Yellow Plant, Carrot (SKU: 33172)
• Seen in 3 sets ( 11504, 42695 )
Lavender Door Frame 1 x 6 x 6 (SKU: 42205)
• Seen in 3 sets ( 80058, 10352 )
Reddish Orange Animal / Plant, Coral / Sea Weed (SKU: 49577)
• Seen in 3 sets ( 10366, 11386 )
Trans-Light Blue Plate Special 2 x 2 with Bar Frame Round (SKU: 7068)
• Seen in 3 sets ( 45202, 75442 )
Opal Trans-Light Blue Brick Round 4 x 4 Dome Top with Round 2 x 2 Recessed, 4 Studs (SKU: 79850)
• Seen in 3 sets ( 43297, 43299 )

Uncommon Parts 7 pieces
Pearl Gold Creature Body Part, Horn (Unicorn) with Small Pin (SKU: 7199)
• Seen in 4 sets (incl. 31175, 42684, 42700)
Lime Brick 2 x 2 Corner (SKU: 2357)
• Seen in 5 sets (incl. 42674, 60469, 72042, 40871)
Dark Azure Bar 4L (Lightsaber Blade / Wand) (SKU: 30374)
• Seen in 5 sets (incl. 31220, 42700, 42702)
Bright Light Orange Technic Beam 1 x 15 Thick (SKU: 32278)
• Seen in 5 sets (incl. 10303, 42172)
Opal Trans-Light Blue Helmet Round Sphere with Small Hole (SKU: 51283)
• Seen in 5 sets (incl. 43244, 76780)
Trans-Clear Brick Special 1 x 2 with 1 Center Stud on 1 Side, No Bottom Stud Holder (SKU: 7133)
• Seen in 5 sets (incl. 11040, 43026, 76467)
Dark Pink Plate Special 1 x 2 with Bar Up [Horizontal Arm 5mm] (SKU: 88072)
• Seen in 5 sets (incl. 77241, 11215, 42704)

Color Insights & Harmony

Complete chromatic distribution, dominant shades, and cross-set color matching.

Hex: Count: Share:

Included Palette

The complete chromatic blueprint and exact piece counts defining this set's look.

144 pcs (16.9%) Medium Lavender

131 pcs (15.4%) Tan

72 pcs (8.4%) Medium Azure

69 pcs (8.1%) White

51 pcs (6.0%) Pearl Gold

44 pcs (5.2%) Bright Light Orange

32 pcs (3.8%) Bright Light Yellow

30 pcs (3.5%) Light Bluish Gray

30 pcs (3.5%) Dark Pink

27 pcs (3.2%) Trans-Light Blue

25 pcs (2.9%) Trans-Clear

22 pcs (2.6%) Nougat

21 pcs (2.5%) Black

19 pcs (2.2%) Lime

17 pcs (2.0%) Blue Violet

13 pcs (1.5%) Dark Bluish Gray

13 pcs (1.5%) Lavender

12 pcs (1.4%) Opal Trans-Dark Pink

11 pcs (1.3%) Magenta

11 pcs (1.3%) Vibrant Yellow

8 pcs (0.9%) Opal Trans-Purple

7 pcs (0.8%) Orange

7 pcs (0.8%) Dark Tan

6 pcs (0.7%) Reddish Orange

6 pcs (0.7%) Opal Trans-Bright Green

5 pcs (0.6%) Red

5 pcs (0.6%) Yellow

4 pcs (0.5%) Reddish Brown

2 pcs (0.2%) Bright Pink

2 pcs (0.2%) Sand Green

2 pcs (0.2%) Opal Trans-Light Blue

1 pcs (0.1%) Green

1 pcs (0.1%) Dark Orange

1 pcs (0.1%) Dark Azure

1 pcs (0.1%) Dark Blue

1 pcs (0.1%) Light Nougat

The Mix

A proportional breakdown of the defining colors shaping this set's aesthetic.

36 Colors

Matching Sets

Grannies with Bingo and Bluey SKU: 11216 • Released 2026 86.3% Match Rapunzel's Castle SKU: 43297 • Released 2026 85.3% Match Belle & the Beast's Enchanted Castle SKU: 43289 • Released 2026 84.8% Match

Jasmine's Petite Tower SKU: 41158 • Released 2019 89.3% Match

Heartlake City Water Park SKU: 42630 • Released 2024 89.1% Match

Ariel's Storybook Adventures SKU: 43176 • Released 2020 89% Match

Puppy's Playhouse SKU: 41025 • Released 2013 88% Match

Izzie's Narwhal Hot-Air Balloon SKU: 71472 • Released 2024 88% Match

Friends: Brickmaster: Treasure Hunt in Heartlake City SKU: 5002890 • Released 2012 87% Match

Rapunzel's Petite Tower SKU: 41163 • Released 2019 86.3% Match

42703 Set Valuation

Projected post-EOL market performance and condition-based compound growth estimates.

Base Brand

Retail MSRP (Base)

$110

Original catalog price

5-Year Est. (Sealed Post-EOL)

$211 — $247

Variance model adjusted

Estimated ROI

+107.5%

Expected mid-range hold

Want custom year projections, condition adjustments, or unboxed values? Open ValueMySet

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LEGO Mermaid Roller Coaster Ride 42703