LEGO Friends Mermaid Roller Coaster Ride Building Toy 42703
873/3159£90.00
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About this product
- Release date: 1 June 2026.
Mermaid-themed roller coaster gift for girls, boys and kids, with 5 mini dolls, including 2 mermaid figures, and accessories to inspire creative play.
LEGO® model number: 42703 - for ages 8 years and over.
Theme: LEGO Friends.
- ROLLER COASTER BUILDING SET – Let the good times roll with this LEGO Friends Mermaid Roller Coaster Ride toy for 8+ year old girls and boys, which includes 5 mini dolls and lots of accessories.
- INTERACTIVE TOY – Kids can have lots of fun role-playing a thrilling day out, taking the friends for a ride on the working mermaid-inspired roller coaster toy.
- 5 LEGO FRIENDS MINI DOLLS – Change up the Autumn mini doll's face to reflect her excitement as she explores the park with Leo and Liann, then discover 2 shimmering mermaid toys for endless fun.
- CREATIVE ACCESSORIES – Inspire storytelling and imaginative play with themed accessories, including bubble tea, a photo strip, sea animals, a LEGO narwhal cuddly toy and more.
- GIFT IDEA FOR KIDS – This mermaid toy makes a great anytime treat or birthday gift for 8+ year old girls and boys who love pretend play and roller coasters.
- The roller coaster measures over 19 cm (7.5 in. ) high, 52 cm (20.5 in. ) wide and 28 cm (11 in. ) deep.
- We are on a mission to breathe new creative life into old LEGO bricks and ensure no brick goes to waste. LEGO Replay gives new life to used bricks by rehoming and repurposing LEGO bricks to good causes. So why not donate your bricks and allow others to reimagine, rebuild and replay.
- Includes 864 pieces.
Dimensions:
- Box size H7.85, W28.2, D54cm.
General Information:
- For ages 8 years and over.
- EAN: 5702018060605.
WARNING(S):
- Not suitable for children under 3 years old.
- Only for domestic use.
Returns
If you want us to collect an unwanted small item after delivery, it costs £3.95 or you can return it to any store for free. You won’t be charged if the item is faulty, or if it was delivered by a supplier.
5
6 reviews
100%
Recommended this product
Each review is verified as authentic by our independent third party and we only publish reviews from customers or Argos Testers who have purchased or used the item. Customers are incentivised to submit product reviews as part of a prize draw.
Really mermaid rocking rollercoaster
My daughter totally loved this build! She is 7 but was able to build it by herself with very little adult help. Great features, enjoyable but still challenging build and really enjoyed by my daughter. She says it’s a ‘really rocking ride’!
PresidentCleverChicken103
Brilliant product
[This review was collected as part of a promotion.] Didn’t take aslong as I thought to build. Instructions was nice and easy to follow. Lightweight able to move room to room. All pieces click in and stay in place.
ChantelL
So much fun
[This review was collected as part of a promotion.] When i first saw it was over 800 pieces i didnt think me and my daughter would be able to do it in one sitting but I was wrong. When i opened the package was lovely to see the bags all numbered to go with the instructions made it so much easier. My daughter loves that theres so much you can do with this lego and the best part it has a moving rollercoaster. My daughter loves that it comes with mermaids as well. It is deffo worth the money. My daughter has spent hours using her imagaination with this lego.
LianneK
Great for kids who enjoy creative builds and imaginative play.
[This review was collected as part of a promotion.] We had a great experience with this Lego mermaid rollercoaster set. It was fun to build without being too complicated, making it a perfect project to do together. My daughter absolutely loved the bright colours and underwater theme, especially all the little details like the sea creatures and decorations. The finished set looks really eye-catching and playful. The best part is that the rollercoaster actually works smoothly, which adds a lot of replay value. She's been enjoying sending the characters around the track again and again. Overall, a fantastic set-engaging to build, visually appealing, and fun to play with.
AtlantaS
My girls love it
My 6 yo enjoyed building the rollercoaster together with me. Both 3 and 6 yo are loving playing with the built model.
InspectorAthleticOwl240
Inspiring a storyteller
This is our 4th venture into the Friends world following the camper van, tree house and axolotl sets. My daughter is a huge fan and has set her sights on more sets from the range. The colours are vibrant and the coaster runs brilliantly. My daughter has dreamed up a whole backstory for the Friends (drawing on experience of a recent trip to Legoland Windsor!) and loved that she could swap Autumn to have a shocked face while riding the coaster. Great job Lego!
JuniorCheekyZugu
The small print
*Prices correct as displayed but are subject to change.
The customer and brand answers you’ll see above are submitted independently. As we don’t review these answers, we can’t take responsibility for anything they may say. The responses from Argos colleagues are accurate at the time of publishing. For the latest info, you should check the product page.