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LEGO Missing Piece Checker

Rule out the usual hiding places first. If the piece really is gone, check the set piece by piece and leave with the element ID LEGO asks for, or a link to buy the part.

Mermaid Gabby's Aquarium Adventure

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11204 Mermaid Gabby's Aquarium Adventure

105 pieces in 59 part and color combinations, plus 3 minifigures.

LEGO counts 103 pieces. This inventory comes from a separate parts catalog and lists 114, including the 9 parts inside the minifigures; the two do not always count the same elements, so their totals differ. Spare parts are counted in neither figure.

Before you call it missing

Builders who report a missing piece often find it in one of these places. Tick each one off as you look.

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Piece checklist

Tan 21 pieces

  • Brick 1 x 2 x 2 with Inside Stud Holder Tan Part 3245c Element 4159279 ×2
  • Brick 1 x 4 Tan Part 3010 Element 4113916 or 301005 ×2
  • Brick 2 x 3 Tan Part 3002 Element 4159739 or 300205 ×1
  • Brick Arch 1 x 3 x 3 [Gothic] Tan Part 13965 Element 6058093 ×4
  • Brick Arch 1 x 4 x 2 Tan Part 6182 Element 6031057 or 4190213 ×2
  • Brick Arch 1 x 8 x 2 Raised Tan Part 16577 Element 6313660 or 6079724 ×2
  • Brick Curved 2 x 1 No Studs [1/2 Bow] Tan Part 11477 Element 6046922 ×1
  • Brick Curved 2 x 1 with Inverted Cutout Tan Part 78666 Element 6383295 ×1
  • Brick Round 4 x 4 Centre Hole Tan Part 87081 Element 6294592 ×1
  • Brick Sloped 65° 2 x 2 x 2 with Bottom Tube Tan Part 3678b Element 6391522 or 6172807 ×2
  • Plate 2 x 8 Tan Part 3034 Element 4113988 or 303405 ×2
  • Plate 4 x 4 Tan Part 3031 Element 4243824 or 4113919 ×1

Medium Azure 19 pieces

  • Brick 1 x 1 Medium Azure Part 3005 Element 6603285 or 4619652 ×4
  • Brick Arch 1 x 3 x 3 [Gothic] Medium Azure Part 13965 Element 6559756 or 6056455 ×4
  • Brick Curved 1 x 2 x 1 No Studs Medium Azure Part 37352 Element 6236578 ×2
  • Brick Curved 1 x 3 x 2 Inverted [Inside Bow] Medium Azure Part 18653 Element 6357619 ×2
  • Plate 2 x 3 Medium Azure Part 3021 Element 6604733 or 6013828 ×2
  • Plate 2 x 6 Medium Azure Part 3795 Element 6603340 or 6146926 ×1
  • Plate Special 2 x 2 with Groove and Center Stud (Jumper) Medium Azure Part 87580 Element 6126090 or 6003008 ×1
  • Slide Curved Left 90° Medium Azure Part 28387 Element 6545920 or 6177207 ×1
  • Tile 1 x 4 with Groove Medium Azure Part 2431 Element 4624705 ×2

Vibrant Yellow 12 pieces

  • Animal, Sea Life Set, Clam Shell Large Vibrant Yellow Part 49595b ×1
  • Animal, Sea Life Set, Clam Shell Small Vibrant Yellow Part 49595d ×2
  • Animal, Sea Life Set, Fish with Bar Vibrant Yellow Part 49595e ×2
  • Animal, Sea Life Set, Octopus Vibrant Yellow Part 49595a ×1
  • Animal, Sea Life Set, Seahorse with Bar Vibrant Yellow Part 49595g ×2
  • Animal, Sea Life Set, Snail with Bar Vibrant Yellow Part 49595f ×2
  • Animal, Sea Life Set, Star Fish Vibrant Yellow Part 49595c ×2

Blue 10 pieces

  • Bar Holder with Hole and Bar Handle Blue Part 23443 Element 6366181 or 6345640 ×1
  • Brick Sloped 45° 2 x 1 Triple with Inside Stud Holder Blue Part 15571 Element 6249783 or 6179332 ×2
  • Plate 8 x 8 with Rounded End Blue Part 41948 Element 6559235 or 6429605 ×2
  • Plate Special 1 x 2, Top Clip [Open O] Blue Part 44861 Element 6537693 ×3
  • Plate Special 8 x 8 x 2/3 with Four 1 x 4 Recessed Edges Blue Part 2628 Element 6559234 ×1
  • Tile 1 x 2 with Groove Blue Part 3069b Element 306923 ×1

Trans-Light Blue 7 pieces

  • Brick Round 2 x 2 Dome Top, Hollow Stud Trans-Light Blue Part 30367c Element 6507968 or 6264989 ×3
  • Cone 1 x 1 [Top Groove] Trans-Light Blue Part 59900 Element 6514027 or 6337639 ×2
  • Panel 1 x 6 x 5 with Under Sea, Coral Coral, Seahorse, Lime Squid, Rocks, Bubbles Print Trans-Light Blue Part 59349pr0034 Element 6570663 or 6542499 ×1
  • Windscreen 4 x 4 x 1 2/3 Canopy Half Sphere with Handle Trans-Light Blue Part 18990 Element 6514148 or 6268646 ×1

Light Aqua 6 pieces

  • Brick Curved 1 x 2 x 1 No Studs Light Aqua Part 37352 Element 6236575 ×1
  • Plate 1 x 2 Light Aqua Part 3023 Element 6146701 or 6015054 ×2
  • Plate 1 x 4 Light Aqua Part 3710 Element 6141592 or 6015057 ×1
  • Plate 2 x 4 Light Aqua Part 3020 Element 6138662 or 6014539 ×2

Dark Azure 5 pieces

  • Tile 1 x 2 with Groove Dark Azure Part 3069b Element 6151659 ×4
  • Tile Special 1 x 2 Grille with Bottom Groove Dark Azure Part 2412b Element 6152109 ×1

Dark Pink 5 pieces

  • Animal Body Part / Plant, Tail / Trunk / Tentacle / Tongue / Vine / Tree Branch (Long Tip) Dark Pink Part 80497 Element 6382560 ×2
  • Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper) Dark Pink Part 15573 Element 6217794 ×1
  • Plate Special Round 2 x 2 with Center Stud (Jumper Plate) Dark Pink Part 18674 Element 6223767 ×2

Lime 3 pieces

  • Plant, Plate 1 x 1 Round with 3 Leaves Lime Part 32607 Element 6286831 ×3

Medium Lavender 3 pieces

  • Crown / Flower / Egg Shell Half Medium Lavender Part 39262 Element 6456640 ×2
  • Treasure Chest Bottom with Rear Slots, No Groove Medium Lavender Part 4738c Element 6056226 ×1

White 3 pieces

  • Plate Round Corner 2 x 2 with 1 x 1 Cutout White Part 79491 Element 6564910 or 6499714 ×2
  • Treasure Chest Lid, Flat with 2 Studs White Part 80835 Element 6437723 ×1

Bright Green 2 pieces

  • Plant, Flower 2 x 2 Leaves - Angular Bright Green Part 4727 Element 4143562 ×2

Coral 2 pieces

  • Animal / Plant, Coral / Sea Weed Coral Part 49577 Element 6292823 ×2

Opal Trans-Dark Pink 2 pieces

  • Brick Round 2 x 2 Dome Top, Hollow Stud Opal Trans-Dark Pink Part 30367c Element 6507969 or 6331340 ×2

Trans-Yellow 2 pieces

  • Plant, Flower, Peony Rose with 2 Layers Trans-Yellow Part 5904 Element 6550817 or 6517937 ×2

Black 1 piece

  • Tile Special 2 x 2 with Top Pin [Squared Holes] Black Part 49153 Element 6313191 ×1

Trans-Bright Green 1 piece

  • Tube, Slide Straight Trans-Bright Green Part 49736 Element 6514304 or 6474960 ×1

Trans-Dark Pink 1 piece

  • Rock - Heart Jewel with Shaft Trans-Dark Pink Part 15745 Element 6240042 or 6058337 ×1

Minifigures 3 figures

  • MerCat Minifigure, checked as a whole figure ×1
  • Gabby, Mermaid Tail Minifigure, checked as a whole figure ×1
  • Kitty Jellyfish Minifigure, checked as a whole figure ×1

Tick each piece as you find it, or mark it missing.

When a piece really is missing

Ask LEGO

LEGO takes requests for pieces missing from a new set through its customer service site. The form asks for the set number and each piece's element ID, the number printed beside the piece in the parts list at the back of the instructions. This checker lists both.

Request a replacement from LEGO

Buy the piece

Mark a piece missing and your list links it to an eBay search for that part, which also covers pieces from older or second-hand sets.

Keep a record

Copy or download your missing list (the CSV opens in any spreadsheet), or print the whole checklist and tick pieces off on paper. Your marks stay in this browser, so you can check a big set over several sittings.

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