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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.

Welcome to the Hidden Side

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70427 Welcome to the Hidden Side

175 pieces in 92 part and color combinations, plus 4 minifigures.

The official piece count includes the 14 parts inside the set's minifigures, which this inventory lists separately. 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.

Look-alike colors in this set

These parts appear in this set in two colors that are easy to confuse. If you are one short in one color, check whether it went in where the other color belongs. Each color has its own element ID in the parts list at the back of the instructions.

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Piece checklist

Black 87 pieces

  • Animal Body Part, Barb / Claw / Tooth / Talon / Horn, Small Black Part 53451 Element 6270103 or 4568385 1 spare in the box ×4
  • Animal, Bat Black Part 30103 Element 4587312 or 4106513 ×1
  • Bar Holder with Clip Black Part 11090 Element 6315887 or 6015891 ×4
  • Brick 1 x 1 Black Part 3005 Element 300526 ×3
  • Brick 1 x 2 x 2 with Inside Stud Holder Black Part 3245c Element 4618852 ×2
  • Brick 1 x 3 Black Part 3622 Element 362226 ×6
  • Brick 2 x 4 Black Part 3001 Element 300126 ×2
  • Brick Arch 1 x 3 x 2 Curved Top Black Part 6005 Element 4618880 or 4188168 ×2
  • Brick Arch 1 x 5 x 4 [Continuous Bow, Raised Underside Cross Supports] Black Part 14395 Element 6075062 ×3
  • Brick Curved 1 x 3 x 2 Inverted [Inside Bow] Black Part 18653 Element 6154860 ×3
  • Brick Curved 3 x 1 No Studs Black Part 50950 Element 4251161 ×1
  • Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Black Part 54200 Element 4504382 or 4287159 1 spare in the box ×3
  • Brick Sloped 30° 1 x 2 x 2/3 Black Part 85984 Element 4548180 ×1
  • Brick Sloped 45° 2 x 1 with Bottom Pin Black Part 3040b Element 4121966 or 304026 ×2
  • Brick Sloped 45° 2 x 2 Black Part 3039 Element 303926 ×1
  • Brick Sloped 75° 2 x 2 x 3 [Solid Studs] Black Part 98560 Element 6007896 ×1
  • Brick Sloped Inverted 45° 2 x 1 Black Part 3665 Element 366526 ×1
  • Creature Body Part, Barb Large (Claw, Talon) with Clip Black Part 16770 Element 6254273 or 6177168 ×2
  • Dish 2 x 2 Inverted [Radar] Black Part 4740 Element 474026 ×1
  • Equipment Paint Roller Brush Handle Smooth Handle Black Part 34076 Element 6192778 ×1
  • Insect, Spider with Elongated Tail Section Black Part 29111 Element 6234806 ×2
  • Lamp Post 2 x 2 x 7 with 4 Base Flutes Black Part 11062 Element 6132809 or 6022202 ×1
  • Plant, Sea Grass Black Part 30093 Element 6295073 or 6272148 ×1
  • Plate 1 x 3 Black Part 3623 Element 362326 ×3
  • Plate 2 x 10 Black Part 3832 Element 383226 ×1
  • Plate 2 x 2 Black Part 3022 Element 302226 ×4
  • Plate 2 x 4 Black Part 3020 Element 302026 ×2
  • Plate 4 x 6 Black Part 3032 Element 303226 ×1
  • Plate Special 1 x 2 [Side Handle Closed Ends] Black Part 48336 Element 4225201 ×2
  • Plate Special 1 x 2 with Angled Handles on Side Black Part 92692 Element 4604304 ×2
  • Plate Special 2 x 3 with Rocks Black Part 27261 Element 6195185 ×2
  • Rock Panel 2 x 4 x 6 Black Part 47847 Element 6296048 ×2
  • Technic Brick 1 x 2 [1 Pin Hole] Black Part 3700 Element 370026 ×2
  • Tile 1 x 2 with Smart Phone and Medium Azure Ghost Print Black Part 3069bpr0266 Element 6271133 ×1
  • Tile 2 x 4 with Groove Black Part 87079 Element 4560182 ×2
  • Tile Round 1 x 1 Quarter Black Part 25269 Element 6172383 1 spare in the box ×3
  • Tile Round 2 x 2 with Bottom Stud Holder Black Part 14769 Element 6070695 Also in Dark Bluish Gray ×2
  • Tile Special 1 x 1 with Clip with Rounded Edges Black Part 15712 Element 6335388 or 6066102 ×3
  • Tile Special 2 x 3 Pentagonal Black Part 22385 Element 6245251 or 6128992 ×2
  • Tile Special Round 1 x 1 with Hollow Bar Black Part 20482 Element 6186675 or 6167933 1 spare in the box ×2
  • Torso - Skeleton Thick Shoulder Pins Black Part 60115 Element 6139126 or 6058871 ×1
  • Weapon Axe Black Part 3835 Element 383526 ×1
  • Wedge Plate 4 x 6 Cut Corners Black Part 32059 Element 4129572 ×1

Light Bluish Gray 26 pieces

  • Brick 1 x 4 Light Bluish Gray Part 3010 Element 4211394 ×4
  • Brick Curved 2 x 2 x 2/3 Light Bluish Gray Part 15068 Element 6102357 ×2
  • Brick Round 2 x 2 with Axle Hole Light Bluish Gray Part 3941 Element 4211526 ×1
  • Brick Special 1 x 2 with Masonry Brick Profile Light Bluish Gray Part 98283 Element 6000066 ×4
  • Panel 1 x 4 x 2 with Side Supports - Hollow Studs Light Bluish Gray Part 14718 Element 6061675 ×2
  • Plate 1 x 3 Light Bluish Gray Part 3623 Element 4211429 or 3623194 ×2
  • Plate Round 4 x 4 with Pin Hole Light Bluish Gray Part 60474 Element 4515351 ×1
  • Plate Special 1 x 2, Top Clip [Split] Light Bluish Gray Part 92280 Element 4598526 ×4
  • Plate Special 2 x 2 with Only 2 studs Light Bluish Gray Part 33909 Element 6212077 ×4
  • Technic Axle Connector Hub with 3 Axles at 120° Light Bluish Gray Part 57585 Element 4502595 ×1
  • Tile 2 x 2 Curved, Macaroni Light Bluish Gray Part 27925 Element 6163990 ×1

Dark Bluish Gray 19 pieces

  • Bracket 1 x 2 - 1 x 2 Dark Bluish Gray Part 99781 Element 6214341 ×3
  • Bracket 1 x 2 - 2 x 4 Dark Bluish Gray Part 93274 Element 6118832 or 4648067 ×1
  • Brick 1 x 6 Dark Bluish Gray Part 3009 Element 4211100 ×4
  • Brick Arch 1 x 6 x 2 - Thin Top without Reinforced Underside [New Version] Dark Bluish Gray Part 15254 Element 6106191 or 6052786 ×2
  • Brick Special 1 x 2 Palisade [aka Log] Dark Bluish Gray Part 30136 Element 4211095 ×1
  • Panel 1 x 4 x 1 with Rounded Corners [Thin Wall] Dark Bluish Gray Part 15207 Element 6092649 ×1
  • Plate 2 x 6 Dark Bluish Gray Part 3795 Element 4211002 ×2
  • Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper) Dark Bluish Gray Part 15573 Element 6092572 ×1
  • Plate Special 2 x 4 with Pins Dark Bluish Gray Part 30157 Element 4509884 or 4210682 ×1
  • Tile 1 x 4 with Groove Dark Bluish Gray Part 2431 Element 4211053 ×2
  • Tile Round 2 x 2 with Bottom Stud Holder Dark Bluish Gray Part 14769 Element 6056296 or 4620079 Also in Black ×1

Medium Azure 16 pieces

  • Plant, Leaves 6 x 5 Medium Azure Part 2417 Element 6295972 ×3
  • Plate 1 x 2 Medium Azure Part 3023 Element 6603337 or 6097419 ×3
  • Plate 2 x 2 Medium Azure Part 3022 Element 6603309 or 4625032 ×1
  • Plate 2 x 6 Medium Azure Part 3795 Element 6603340 or 6146926 ×1
  • Plate 4 x 6 Medium Azure Part 3032 Element 4619515 ×1
  • Plate 4 x 8 Medium Azure Part 3035 Element 6104130 ×1
  • 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 ×1
  • Tile 1 x 4 with Groove Medium Azure Part 2431 Element 4624705 ×1
  • Tile 2 x 2 Curved, Macaroni Medium Azure Part 27925 Element 6258069 ×1
  • Wedge Plate 4 Stud 45° Angle Plate Medium Azure Part 15706 Element 6124250 ×2

Dark Blue 7 pieces

  • Plate 1 x 2 Dark Blue Part 3023 Element 6554191 or 4528981 ×1
  • Plate 1 x 4 Dark Blue Part 3710 Element 4502089 or 4177739 ×4
  • Plate 1 x 6 Dark Blue Part 3666 Element 4508313 or 4177734 ×2

Yellowish Green 7 pieces

  • Plate Special 1 x 1 with Tooth Yellowish Green Part 49668 Element 6267420 ×2
  • Plate Special 1 x 2 with Three Teeth [Tri-Tooth] Yellowish Green Part 15208 Element 6267421 ×1
  • Tile Round 1 x 1 with Monster Eye Print Yellowish Green Part 98138pr9996 Element 6322970 or 6275891 1 spare in the box ×2
  • Tile Special 1 x 2 with Two Vertical Teeth / Tooth Yellowish Green Part 15209 Element 6267419 or 6109486 ×2

Yellow 3 pieces

  • Tile 2 x 2 Curved, Macaroni Yellow Part 27925 Element 6275508 or 6195186 ×1
  • Tile 2 x 2 with Groove Yellow Part 3068b Element 6388487 or 306824 ×2

Dark Azure 2 pieces

  • Plate 1 x 2 Dark Azure Part 3023 Element 4653988 ×2

Light Aqua 2 pieces

  • Plate 1 x 6 Light Aqua Part 3666 Element 6146702 ×2

Trans-Purple 2 pieces

  • Cone 1 x 1 [Top Groove] Trans-Purple Part 59900 Element 6514023 or 6337603 ×2

Coral 1 piece

  • Tile 2 x 2 Curved, Macaroni Coral Part 27925 Element 6250024 ×1

Trans-Neon Green 1 piece

  • Minifig Head [Plain] [Vented Stud - 2 Holes] Trans-Neon Green Part 28621 Element 6168672 ×1

White 1 piece

  • Turntable 2 x 2 Female White Part 27448 Element 6536567 or 6238334 ×1

[No Color/Any Color] 1 piece

  • Sticker Sheet for Set 70427-1 [No Color/Any Color] Part 67022 Element 6293281 ×1

Minifigures 4 figures

  • Jack Davids, Light Aqua Hoodie with Hood and Dark Azure Cap Minifigure, checked as a whole figure ×1
  • Waylon (28621 Head) Minifigure, checked as a whole figure ×1
  • Scrimper (28621 Head) Minifigure, checked as a whole figure ×1
  • Axel Chops (28621 Head) 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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