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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.

Rocket Ride

Checking

3831 Rocket Ride

268 pieces in 91 part and color combinations, plus 3 minifigures.

The official piece count includes the 11 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

Plates Round Curved and Dishes 50 pieces

  • Plate Round Corner 3 x 3 Black Part 30357 Element 4227392 ×8
  • Dish 2 x 2 Inverted [Radar] Light Bluish Gray Part 4740 Element 4211512 ×1
  • Plate Round Corner 4 x 4 Red Part 30565 Element 6297811 or 6106370 ×18
  • Plate Round 1 x 1 with Solid Stud Reddish Brown Part 6141 Element 4216581 1 spare in the box ×12
  • Plate Round 1 x 1 with Solid Stud Trans-Dark Blue Part 6141 Element 6514055 or 6240214 1 spare in the box ×2
  • Plate Round 1 x 1 with Solid Stud Trans-Green Part 6141 Element 6514057 or 6240221 1 spare in the box ×1
  • Plate Round 1 x 1 with Solid Stud Trans-Orange Part 6141 Element 6514059 or 6240227 1 spare in the box ×6
  • Plate Round 1 x 1 with Solid Stud Trans-Red Part 6141 Element 6514051 or 6208450 2 spares in the box ×2

Plates 40 pieces

  • Plate 1 x 4 Black Part 3710 Element 371026 ×3
  • Plate 6 x 10 Black Part 3033 Element 303326 ×1
  • Plate 2 x 3 Blue Part 3021 Element 302123 ×6
  • Plate 1 x 6 Dark Bluish Gray Part 3666 Element 4211056 ×6
  • Plate 1 x 2 Light Bluish Gray Part 3023 Element 4211398 or 3023194 ×2
  • Plate 1 x 2 Red Part 3023 Element 302321 ×3
  • Plate 1 x 6 Red Part 3666 Element 366621 ×2
  • Plate 1 x 6 Reddish Brown Part 3666 Element 4221590 ×3
  • Plate 2 x 10 Reddish Brown Part 3832 Element 4211214 ×3
  • Plate 4 x 6 Reddish Brown Part 3032 Element 4271874 or 4211213 ×1
  • Plate 1 x 1 Tan Part 3024 Element 4159553 or 302405 ×3
  • Plate 6 x 6 Tan Part 3958 Element 4125217 ×1
  • Plate 2 x 3 White Part 3021 Element 6550136 or 302101 ×1
  • Plate 2 x 4 White Part 3020 Element 6552098 or 302001 ×4
  • Plate 2 x 6 White Part 3795 Element 6550146 or 379501 ×1

Bricks Round and Cones 17 pieces

  • Brick Round 1 x 1 Open Stud Green Part 3062b Element 306228 ×4
  • Brick Round 1 x 1 Open Stud Red Part 3062b Element 306221 ×1
  • Brick Round Corner 2 x 2 Macaroni with Stud Notch White Part 3063b Element 4501579 or 306301 ×8
  • Brick Round Corner 4 x 4 Macaroni Wide with 3 Studs White Part 48092 Element 6550183 or 6337627 ×4

Panels 17 pieces

  • Panel 1 x 1 x 1 Corner Red Part 6231 Element 4190219 or 623121 ×4
  • Panel 1 x 2 x 2 [Hollow Studs] Trans-Clear Part 4864b Element 4113028 ×4
  • Panel 4 x 4 x 6 Quarter Cylinder White Part 30562 Element 4513990 or 4142926 ×8
  • Panel 1 x 4 x 1 with Rounded Corners [Thick Wall] Yellow Part 43337 Element 6078611 or 4239160 ×1

Tiles 17 pieces

  • Tile 2 x 2 with Groove Light Bluish Gray Part 3068b Element 4211413 ×2
  • Tile 1 x 2 with Groove Red Part 3069b Element 4178178 or 306921 ×5
  • Tile 2 x 2 with Groove Red Part 3068b Element 306821 ×4
  • Tile 1 x 4 with Groove Reddish Brown Part 2431 Element 4211194 ×6

Bricks 14 pieces

  • Brick 2 x 2 Green Part 3003 Element 300328 ×1
  • Brick 1 x 2 Red Part 3004 Element 4613961 or 300421 ×4
  • Brick 1 x 4 Red Part 3010 Element 301021 ×4
  • Brick 2 x 4 Red Part 3001 Element 300121 ×3
  • Brick 1 x 2 x 2 with Inside Axle Holder White Part 3245b ×1
  • Brick 2 x 2 White Part 3003 Element 6552095 or 6548256 ×1

Plates Special 12 pieces

  • Plate Special 1 x 1 with Clip Light, Bar Hole [Thick Ring] Black Part 4081b Element 6281993 or 4632571 ×1
  • Plate Special 2 x 2 with 2 Pin Holes Black Part 2817 Element 281726 ×1
  • Plate Special 2 x 2 with Towball Light Bluish Gray Part 3729 Element 4239654 ×1
  • Plate Special 2 x 2 with Towball Socket, Short, 4 Slots Light Bluish Gray Part 3730 Element 4272037 or 4211447 ×1
  • Bracket 1 x 2 - 2 x 2 White Part 44728 Element 6619296 or 6117940 ×1
  • Plate Special 1 x 1 with Clip Vertical [Thick U Clip] White Part 4085c Element 408501 ×2
  • Plate Special 1 x 2 with 1 Stud without Groove (Jumper) White Part 3794a ×4
  • Plate Special 2 x 2 with Pin on Bottom White Part 2476a Element 6313603 or 4293876 ×1

Technic Bricks 12 pieces

  • Technic Brick 1 x 1 with Pin Hole Red Part 6541 Element 654121 ×12

Bricks Curved 10 pieces

  • Brick Arch 1 x 5 x 4 [Continuous Bow] Red Part 2339 Element 4629997 or 4519935 ×4
  • Brick Curved 1 x 3 x 2 Red Part 33243 Element 6289870 or 6228956 ×4
  • Brick Curved 1 x 2 x 1 1/3 with Curved Top White Part 6091 Element 6285777 or 609101 ×2

Bricks Special 10 pieces

  • Brick Special 2 x 2 with 2 Pins and Axle Hole Light Bluish Gray Part 30000 Element 6356172 or 4211752 ×2
  • Brick Special 1 x 2 with Pin White Part 2458 Element 4160228 or 245801 ×8

Bars, Ladders and Fences 7 pieces

  • Antenna 1 x 4 with Rounded Top Light Bluish Gray Part 3957a ×1
  • Antenna 8H Whip Light Bluish Gray Part 2569 Element 6265157 or 6164381 1 spare in the box ×1
  • Lever Small Base with Black Lever Light Bluish Gray Part 298c02 Element 4221775 2 spares in the box ×3
  • Bar 1 x 6 [Closed Studs] White Part 6140 Element 4288961 or 4279386 ×1
  • Bar 6L with Stop Ring White Part 63965 Element 6170419 or 6081986 ×1

Plates Wedged 7 pieces

  • Wedge Plate 3 x 6 Cut Corners Black Part 2419 Element 241926 Also in Dark Bluish Gray ×1
  • Wedge Plate 3 x 6 Cut Corners Dark Bluish Gray Part 2419 Element 4210984 Also in Black ×6

Supports, Girders and Cranes 6 pieces

  • Support Round 1 x 1 x 6 Solid Pillar Reddish Brown Part 43888 Element 4520612 ×6

Wheels and Tyres 6 pieces

  • Wheel Skateboard / Trolley Black Part 2496 Element 6223673 or 4569104 ×2
  • Wheel Hard Plastic Small (22mm D. x 24mm) Red Part 6118 Element 4520122 ×4

Bricks Sloped 5 pieces

  • Brick Sloped 33° 3 x 1 Green Part 4286 Element 4107637 or 428628 ×2
  • Brick Sloped 45° 2 x 2 Green Part 3039 Element 303928 ×1
  • Brick Sloped 45° 2 x 2 with Green Radar, Green/Red Buttons and Disk Slot Print White Part 3039pr0002 Element 4195659 ×1
  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] White Part 3660 Element 366001 ×1

Hinges, Arms and Turntables 5 pieces

  • Hinge Plate 1 x 2 Locking with 2 Fingers on Side, 9 Teeth Black Part 60471 Element 4515340 ×1
  • Hinge Plate 1 x 4 Swivel Top / Base - Solid Clip [Complete Assembly] Black Part 73983 Element 6102782 or 74011 ×3
  • Hinge Plate 1 x 2 Locking with 1 Finger on Side, with Groove Light Bluish Gray Part 44567a Element 4211814 ×1

Minifig Accessories 5 pieces

  • Equipment Net [Fabuland Wind Gauge] Bright Light Orange Part 4433 Element 4243947 ×2
  • Equipment Weapon, Loudhailer / Speaker / Blaster / Space Gun Dark Bluish Gray Part 4349 Element 4210698 ×2
  • Tap 1 x 1 with Hole in Spout Light Bluish Gray Part 4599a ×1

Minifig Headwear 5 pieces

  • Hat, Chef / Baker Trans-Dark Pink Part 3898 Element 4280173 ×5

Tiles Special 5 pieces

  • Tile Special 1 x 1 with Clip and Straight Tips Light Bluish Gray Part 2555 Element 4211369 or 2555194 ×2
  • Tile Special 2 x 2 with Top Pin Light Bluish Gray Part 2460 Element 4211365 ×1
  • Tile Special 1 x 2 Grille with Bottom Groove Yellow Part 2412b Element 241224 ×2

Transportation - Land 5 pieces

  • Handlebars Black Part 30031 Element 3003126 ×1
  • Seat / Chair 2 x 2 Blue Part 4079 ×2
  • Wheel Holder, Plate, Round 2 x 2 Thin with Clips Light Bluish Gray Part 2655 Element 6152344 or 4211373 ×2

Plants & Trees 3 pieces

  • Plant, Sea Grass Trans-Green Part 30093 Element 4256382 or 4247326 ×3

Technic Pins 3 pieces

  • Technic Pin 1/2 without Friction Ridges Blue Part 4274 Element 4143005 1 spare in the box ×1
  • Technic Pin without Friction Ridges Lengthwise Light Bluish Gray Part 3673 Element 4211807 or 3673194 1 spare in the box ×2

Technic Connectors 2 pieces

  • Technic Pin Connector Plate 1 x 2 x 1 2/3 [Two Holes On Top] Red Part 32530 Element 4207715 or 3253021 ×2

Flags, Banners and Signs 1 piece

  • Flag 2 x 2 Square [Thin Clips] White Part 2335 Element 4523403 or 233551 ×1

Minifig Shields, Weapons, & Tools 1 piece

  • Tool Hammer / Mallet Large Black Part 4522 Element 452226 ×1

Stickers 1 piece

  • Sticker Sheet for Set 3831-1 [No Color/Any Color] Part 61873 Element 4520096 ×1

Technic Panels 1 piece

  • Technic Panel Dome 7 x 7 x 5 with Pin Holes White Part 57587 Element 4520125 ×1

Transportation - Sea and Air 1 piece

  • Propeller 3 Blade 3 Diameter with Axle Cross Black Part 6041 Element 604126 ×1

Minifigures 3 figures

  • Patrick Star in Astronaut Suit Minifigure, checked as a whole figure ×1
  • SpongeBob Squarepants in Astronaut Suit Minifigure, checked as a whole figure ×1
  • Sandy Cheeks in Astronaut Suit 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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