Ariel's Undersea Castle

1 mould appears in no other set

• Duplo Figure with Hair Swept Right Red, Azure Mermaid Legs (Ariel)

4 printed parts are only in this set

• Duplo Brick 1 x 2 x 2 with Three Singing Fish PrintTrans-Light Blue
• Duplo Brick 2 x 4 x 2 Arch with Seaweed, Starfish, and Bubbles PrintMedium Azure
• Duplo Brick Round 2 x 2 x 2 with Shell and Bubbles PrintBright Light Yellow
• Duplo Disk with Xylophone and Starfish PrintBright Light Yellow

7 parts appear in only a few other sets

• Duplo Plate Round 4 x 8 Semi-CircleDark Pink · ×2also in 10877 Belle's Tea Party (all Duplo)
• Duplo Plate Round 4 x 4Yellowalso in 10921 Super Heroes Lab (all Duplo)
• Duplo Animal Fish with Large Eyes and Stripes on Top Print (Flounder / Fabius)Yellowalso in 10515 Ariel's Undersea Castle, 10420 Ariel and Flounder's Café Stand (all Duplo)
• Duplo Support / Umbrella Stand with Square Base (fits 92002)Dark Pinkalso in 10844 Minnie Mouse Bow-tique, 10873 Minnie's Birthday Party (all Duplo)
• Duplo Brick 2 x 2Glitter Trans-Light Blue · ×2also in 10899 Frozen Ice Castle, 10934 Creative Animals, 10422 3in1 Space Shuttle Adventure (all Duplo)
• Duplo Plant / Tree / SeaweedTrans-Greenalso in 10907 World Animals, 10910 Submarine Adventure, 45029 Animals, 45825
• Duplo Plate Round 4 x 8 Semi-CircleBright Light Yellowalso in 10975 Wild Animals of the World, 10432 Peppa Pig Boat Trip, 10435 Ariel's Magical Underwater Palace, 45828 FIRST LEGO League Challenge 2024 - Submerged Discover Set

6 parts are otherwise only found in Duplo sets

• Duplo Plant, Flower with 1 Top StudCoral · ×2
• Duplo Plate 2 x 4Light Aqua · ×2
• Duplo Plate 2 x 4Bright Light Yellow · ×2
• Duplo Brick 2 x 3Medium Azure
• Duplo Playground Slide Curved Right 90°Medium Azure
• and 1 more

6 existing moulds first came out in their colour in 2020, including in this set

• Duplo Plant, Flower with 1 Top StudCoral · ×2
• Duplo Plate 2 x 4Light Aqua · ×2
• Duplo Plate 2 x 4Bright Light Yellow · ×2
• Duplo Plate Round 4 x 4Yellow
• Duplo Plate Round 4 x 8 Semi-CircleBright Light Yellow
• and 1 more