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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.

Costume Party with Unicorn & Fairy

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42661 Costume Party with Unicorn & Fairy

240 pieces in 116 part and color combinations, plus 4 minifigures.

LEGO counts 261 pieces. This inventory comes from a separate parts catalog and lists 262, including the 22 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

Plates Special 69 pieces

  • Plate Special Round 1 x 1 with Hollow Stud and Underside Clip Black Part 5264 Element 6534180 1 spare in the box ×4
  • Plate Special 2 x 2 with Groove and Center Stud (Jumper) Bright Pink Part 87580 Element 6251842 ×10
  • Plate Special 2 x 2 with Groove and Center Stud (Jumper) Coral Part 87580 Element 6287638 ×2
  • Bracket 2 x 2 with 1 x 2 Vertical Studs Dark Azure Part 41682 Element 6424641 ×4
  • Plate Special 1 x 2 with 5.9mm Centre Side Towball Dark Bluish Gray Part 14417 Element 6414560 or 6338160 ×1
  • Plate Special Round 2 x 2 with Center Stud (Jumper Plate) Dark Pink Part 18674 Element 6223767 ×1
  • Plate Special 1 x 1 with Clip Horizontal [Thick Open O Clip] Dark Purple Part 61252 Element 6347297 or 6331505 ×4
  • Plate Special 2 x 2 x 2/3 with Two Studs On Side and Two Raised [Half Hollow Anti-stud] - Updated Version Light Aqua Part 4304 Element 6470182 ×6
  • Plate Special 1 x 2 with Bar Up [Horizontal Arm 5mm] Light Bluish Gray Part 88072 Element 6261353 or 4611702 ×2
  • Plate Special Round 1 x 1 with Hollow Stud and Horizontal Bar 1L Light Bluish Gray Part 32828 Element 6227897 1 spare in the box ×4
  • Plate Special 1 x 1 with Clip Vertical [Thick Open O Clip] Medium Azure Part 60897 Element 6445843 ×6
  • Plate Special 1 x 2 [Side Handle Closed Ends] Medium Azure Part 48336 Element 6236582 ×2
  • Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper) Medium Azure Part 15573 Element 6603587 or 6331949 ×8
  • Plate Special 1 x 2 with Clip Vertical on End Medium Azure Part 78256 Element 6441239 ×2
  • Plate Special 2 x 2 with Groove and Center Stud (Jumper) Medium Azure Part 87580 Element 6126090 or 6003008 ×3
  • Bracket 2 x 2 with 1 x 2 Vertical Studs White Part 41682 Element 6615545 or 6250019 ×4
  • Plate Special 1 x 2 Side Handle [Free Ends] White Part 2540 Element 4140583 or 254051 ×1
  • Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper) White Part 15573 Element 6550152 or 6051511 ×1
  • Plate Special 1 x 2 with Clips Horizontal [Open O Clips] White Part 60470b Element 6347287 or 4556152 ×2
  • Plate Special 3 x 5 Cloud with 3 Center Studs White Part 35470 Element 6223667 ×2

Plates 29 pieces

  • Plate 2 x 10 Bright Green Part 3832 Element 6462430 ×1
  • Plate 1 x 8 Bright Pink Part 3460 Element 6143789 ×1
  • Plate 1 x 2 Coral Part 3023 Element 6258094 ×2
  • Plate 1 x 2 Dark Azure Part 3023 Element 4653988 ×2
  • Plate 2 x 2 Dark Orange Part 3022 Element 4615606 or 4603741 ×1
  • Plate 1 x 6 Dark Purple Part 3666 Element 4655691 or 4225141 ×2
  • Plate 2 x 3 Light Aqua Part 3021 Element 6426724 or 6192108 ×1
  • Plate 2 x 6 Medium Azure Part 3795 Element 6603340 or 6146926 ×1
  • Plate 1 x 2 Vibrant Yellow Part 3023 Element 6382324 ×4
  • Plate 1 x 6 Vibrant Yellow Part 3666 Element 6525159 ×2
  • Plate 2 x 6 Vibrant Yellow Part 3795 Element 6391549 ×5
  • Plate 1 x 2 White Part 3023 Element 6552100 or 6548261 ×2
  • Plate 1 x 4 White Part 3710 Element 6552108 or 6548266 ×2
  • Plate 2 x 2 White Part 3022 Element 6552099 or 6548260 ×1
  • Plate 4 x 12 White Part 3029 Element 4168072 or 302901 ×1
  • Plate 4 x 6 White Part 3032 Element 303201 ×1

Tiles Round and Curved 27 pieces

  • Tile Round 2 x 2 with Vinyl Record, Bright Light Orange Center, Magenta Music Note Print Black Part 14769pr1252 Element 6431014 ×1
  • Tile 2 x 2 Curved, Macaroni Bright Green Part 27925 Element 6382958 ×2
  • Tile 4 x 4 Curved, Macaroni Coral Part 27507 Element 6458179 or 6425370 ×2
  • Tile Round 1 x 1 Dark Brown Part 98138 Element 6322813 1 spare in the box ×1
  • Tile Round 1 x 1 Half Circle Dark Purple Part 24246 Element 6313558 1 spare in the box ×6
  • Tile Round 1 x 1 Half Circle Medium Azure Part 24246 Element 6375606 1 spare in the box ×6
  • Tile Round 1 x 2 Half Circle Medium Azure Part 1748 Element 6510074 or 6445337 1 spare in the box ×1
  • Tile Round 1 x 1 with Pink Donut Print Medium Nougat Part 98138pr0090 Element 6329593 1 spare in the box ×2
  • Tile Round 1 x 1 with Christmas Cookie Print Tan Part 98138pr0255 Element 6361753 1 spare in the box ×2
  • Tile 3 x 3 Curved, Macaroni Vibrant Yellow Part 79393 Element 6545922 ×2
  • Tile Round 1 x 1 Quarter White Part 25269 Element 6548285 or 6172366 1 spare in the box ×2

Bars, Ladders and Fences 20 pieces

  • Bar 3L Dark Green Part 87994 Element 6525789 1 spare in the box ×1
  • Bar, Angled with 1 x 1 Round Plate / Stud on End Trans-Clear Part 65578 Element 6510188 or 6285587 1 spare in the box ×6
  • Antenna 8H Whip Trans-Dark Pink Part 2569 Element 6362970 ×4
  • Bar 4L (Lightsaber Blade / Wand) Trans-Dark Pink Part 30374 Element 6507885 or 6291400 ×2
  • Bar 4L (Lightsaber Blade / Wand) Trans-Light Blue Part 30374 Element 6507882 or 6170187 ×2
  • Bar Holder with Hole and Bar Handle White Part 23443 Element 6322489 or 6290268 ×4
  • Lever Small Base with Black Lever White Part 298c02 Element 73737 1 spare in the box ×1

Tiles Special 19 pieces

  • Tile Special Round 1 x 1 with Hollow Bar Black Part 20482 Element 6186675 or 6167933 1 spare in the box ×1
  • Tile Special Round 1 x 1 with Hollow Bar Bright Light Orange Part 20482 Element 6223719 1 spare in the box ×2
  • Tile Special Round 1 x 1 with Hollow Bar Bright Pink Part 20482 Element 6230579 1 spare in the box ×4
  • Tile Special 1 x 3 Inverted with Center Hole White Part 35459 Element 6548289 or 6223491 ×4
  • Tile Special Round 1 x 1 with Hollow Bar Yellowish Green Part 20482 Element 6223506 1 spare in the box ×8

Tiles 16 pieces

  • Tile 2 x 2 with Groove Black Part 3068b Element 306826 ×1
  • Tile 4 x 4 Black Part 1751 Element 6469830 ×1
  • Tile 1 x 2 with Groove Bright Green Part 3069b Element 6195258 or 4195201 ×3
  • Tile 1 x 2 with Groove Bright Pink Part 3069b Element 4580010 ×5
  • Tile 1 x 3 Medium Azure Part 63864 Element 6097492 ×2
  • Tile 1 x 6 with Groove Medium Azure Part 6636 Element 6603342 or 6185309 ×2
  • Tile 2 x 3 Medium Azure Part 26603 Element 6233166 ×1
  • Tile 1 x 2 with Groove Orange Part 3069b Element 4188771 ×1

Bricks Round and Cones 15 pieces

  • Brick Round 2 x 2 Dome Bottom [Open Stud] Bright Pink Part 15395 Element 6541655 ×2
  • Brick Round 2 x 2 Dome Top, Vented Stud Bright Pink Part 3262 Element 6519484 ×2
  • Brick Round 2 x 2 Dome Bottom [Open Stud] Medium Azure Part 15395 Element 6132411 ×2
  • Brick Round 2 x 2 Dome Top, Vented Stud Medium Azure Part 3262 Element 6429058 ×2
  • Brick Round Corner 2 x 2 Macaroni with Stud Notch and Reinforced Underside [New Style] Medium Azure Part 85080 Element 6176171 or 4655336 ×4
  • Cone 1 x 1 [Top Groove] Trans-Bright Green Part 59900 Element 6514024 or 6337628 ×1
  • Cone 1 x 1 [Top Groove] Trans-Dark Pink Part 59900 Element 6514026 or 6337637 ×1
  • Cone 1 x 1 [Top Groove] Trans-Orange Part 59900 Element 6514017 or 6172233 ×1

Plates Round Curved and Dishes 15 pieces

  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Bright Green Part 4032a Element 6138624 or 4114430 ×1
  • Plate Round 1 x 1 with Open Stud Dark Pink Part 85861 Element 6230582 1 spare in the box ×1
  • Plate Round 1 x 1 Swirled Top / Poo Lavender Part 53119 Element 6492250 1 spare in the box ×1
  • Plate Round 1 x 1 with Solid Stud Light Aqua Part 6141 Element 6382504 1 spare in the box ×2
  • Plate 8 x 8 with Rounded End Medium Azure Part 41948 Element 6296050 ×1
  • Plate Round 1 x 1 with Solid Stud Medium Azure Part 6141 Element 6102986 1 spare in the box ×2
  • Plate Round Corners 2 x 6 Double Medium Azure Part 18980 Element 6292824 ×1
  • Plate Round 1 x 1 with Solid Stud Opal Trans-Clear Part 6141 Element 6514061 or 6430373 1 spare in the box ×1
  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Orange Part 4032a Element 6030521 or 4164243 ×1
  • Dish 2 x 2 Inverted [Radar] Trans-Bright Green Part 4740 Element 6589436 or 6518820 ×2
  • Plate Round Corners 2 x 6 Double Vibrant Yellow Part 18980 Element 6388034 ×1
  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Yellow Part 4032a Element 403224 ×1

Bricks Curved 5 pieces

  • Brick Curved Inverted 2 x 2 x 2/3 Bright Green Part 32803 Element 6404643 ×2
  • Brick Curved 2 x 2, Two Top Studs White Part 30165 Element 6609535 or 4624989 ×1
  • Brick Curved 4 x 1 Double, No Studs White Part 93273 Element 6552143 or 6023806 ×1
  • Brick Curved Inverted 2 x 2 x 2/3 White Part 32803 Element 6210385 ×1

Bricks 4 pieces

  • Brick 1 x 3 Light Aqua Part 3622 Element 6295228 or 6172587 ×1
  • Brick 1 x 2 without Bottom Tube Trans-Bright Green Part 3065 Element 6514269 or 6244911 ×1
  • Brick 1 x 2 without Bottom Tube Trans-Dark Pink Part 3065 Element 6514270 or 6244913 ×1
  • Brick 1 x 2 without Bottom Tube Trans-Orange Part 3065 Element 6514273 or 6466832 ×1

Plants & Trees 4 pieces

  • Plant, Carrot Top Lime Part 33183 Element 6420268 1 spare in the box ×1
  • Plant, Carrot Orange Part 33172 Element 6424015 or 6103249 ×1
  • Plant, Cherries Red Part 22667 Element 6100565 or 6062390 1 spare in the box ×1
  • Plant, Sunflower 2 x 2 with 16 Petals Yellow Part 6901 Element 6509767 ×1

Animal / Creature Body Parts 3 pieces

  • Creature Body Part, Wing 4 x 7 Left with Feathers and Handles for Clips Flat Silver Part 20313 Element 6398397 or 6114675 ×1
  • Creature Body Part, Wing 4 x 7 Right with Feathers and Handles for Clips Flat Silver Part 20312 Element 6398396 or 6114674 ×1
  • Creature Body Part, Horn (Unicorn) with Small Pin Opal Trans-Clear Part 7199 Element 6527047 2 spares in the box ×1

Bricks Special 3 pieces

  • Brick Special 1 x 1 with Stud on 1 Side Bright Green Part 87087 Element 6464978 or 6223735 ×1
  • Brick Special 1 x 1 with Stud on 1 Side Bright Pink Part 87087 Element 4621554 ×1
  • Brick Special 1 x 1 with Stud on 1 Side Orange Part 87087 Element 6431334 or 6149652 ×1

Minifig Accessories 3 pieces

  • Food Cupcake with Stud Light Aqua Part 79743 Element 6361352 ×1
  • Equipment Magic Wand Trans-Dark Pink Part 6124 Element 6245512 or 4499710 1 spare in the box ×1
  • Equipment Cup / Teacup Saucer with Recessed Stud on Top [Plain] White Part 38799 Element 6508151 or 6475151 1 spare in the box ×1

Animals / Creatures 2 pieces

  • Animal, Cat, Chubby with Olive Green Eyes, Orange Fur, Black Mustache Print White Part 2652pr0006 Element 6537804 ×1
  • Animal, Horse with Raised Leg, Dark Pink Mane and Tail, Dark Azure Eyes Print White Part 69830pr0008 Element 6543255 ×1

Minifig Headwear Accessories 2 pieces

  • Headwear Accessory Hat / Top Hat with Pin and Anti-Stud Black Part 77108 Element 6485111 ×1
  • Headwear Accessory Bow with Heart, Long Ribbon and Pin Red Part 11618 Element 6499709 1 spare in the box ×1

Minifig Headwear 1 piece

  • Hair Scruffy and Swept Right Reddish Brown Part 40938 Element 6424457 or 6284153 ×1

Minifig Shields, Weapons, & Tools 1 piece

  • Weapon Trident Pearl Gold Part 92290 Element 6270116 or 4595077 1 spare in the box ×1

Panels 1 piece

  • Panel 1 x 2 x 2 [Side Supports / Hollow Studs] Medium Azure Part 87552 Element 6369854 ×1

Stickers 1 piece

  • Sticker Sheet for Set 42661-1 [No Color/Any Color] Part 10112472 Element 6538803 ×1

Minifigures 4 figures

  • Autumn - Bee Costume Minifigure, checked as a whole figure ×1
  • Paisley - Fairy Costume Minifigure, checked as a whole figure ×1
  • Leo - Bunny Costume Minifigure, checked as a whole figure ×1
  • Olly - Merman Costume Minifigure, checked as a whole figure ×1

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

When a piece really is missing

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