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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.

ARCTIC IMPACT Challenge Kit

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9784 ARCTIC IMPACT Challenge Kit

1,348 pieces in 81 part and color combinations, plus 5 minifigures.

The official piece count includes the 20 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

Technic Bushes 358 pieces

  • Technic Bush Blue Part 3713 Element 4189350 or 4188142 ×300
  • Technic Bush Light Gray Part 3713 Element 4125313 or 659002 ×14
  • Technic Bush 1/2 Smooth with Axle Hole Reduced Light Gray Part 32123a 1 spare in the box ×44

Bricks Round and Cones 252 pieces

  • Brick Round 2 x 2 with Axle Hole Black Part 3941 Element 614376 or 614326 ×9
  • Brick Round 2 x 2 with Axle Hole Trans-Clear Part 3941 Element 6514281 or 6273152 Also in White ×3
  • Brick Round 2 x 2 with Axle Hole White Part 3941 Element 6601920 or 614351 12 spares in the box Also in Trans-Clear ×240

Bricks 198 pieces

  • Brick 2 x 4 Black Part 3001 Element 300126 ×5
  • Brick 4 x 6 Blue Part 2356 Element 4190794 or 4181122 ×4
  • Brick 2 x 10 White Part 3006 Element 4617855 or 300601 ×26
  • Brick 2 x 4 White Part 3001 Element 6552094 or 300101 ×47
  • Brick 2 x 6 White Part 2456 Element 6552122 or 4249698 ×17
  • Brick 2 x 8 White Part 3007 Element 6619309 or 6033776 ×10
  • Brick 2 x 10 Yellow Part 3006 Element 6119276 or 6073100 ×33
  • Brick 2 x 4 Yellow Part 3001 Element 300124 ×15
  • Brick 2 x 6 Yellow Part 2456 Element 4181143 or 245624 ×9
  • Brick 2 x 8 Yellow Part 3007 Element 4639693 or 300724 ×32

Wheels and Tyres 140 pieces

  • Technic Wedge Belt Wheel [aka Pulley] Brown Part 4185 Element 4162482 or 4107463 ×134
  • Technic Wedge Belt Wheel [aka Pulley] Yellow Part 4185 Element 6636439 or 6363273 ×6

Technic Axles 98 pieces

  • Technic Axle 10 Black Part 3737 Element 373726 ×4
  • Technic Axle 12 Black Part 3708 Element 370826 ×10
  • Technic Axle 2 Notched Black Part 32062 Element 4109810 or 3206226 ×13
  • Technic Axle 3 Black Part 4519 Element 6238084 or 451926 ×5
  • Technic Axle 4 Black Part 3705 Element 370526 ×28
  • Technic Axle 6 Black Part 3706 Element 370626 ×30
  • Technic Axle 8 Black Part 3707 Element 370726 ×8

Plates 68 pieces

  • Plate 1 x 4 Black Part 3710 Element 371026 ×1
  • Plate 1 x 6 Black Part 3666 Element 366626 ×1
  • Plate 4 x 4 Black Part 3031 Element 4243819 or 303126 ×1
  • Plate 6 x 16 Black Part 3027 Element 302726 ×6
  • Plate 6 x 8 Black Part 3036 Element 303676 or 303626 ×1
  • Plate 1 x 2 Red Part 3023 Element 302321 ×6
  • Plate 1 x 8 Red Part 3460 Element 346021 ×6
  • Plate 4 x 4 Red Part 3031 Element 4243814 or 303121 ×6
  • Plate 6 x 8 Red Part 3036 Element 303671 or 303621 ×3
  • Plate 1 x 2 White Part 3023 Element 6552100 or 6548261 ×2
  • Plate 2 x 2 White Part 3022 Element 6552099 or 6548260 ×15
  • Plate 6 x 16 White Part 3027 Element 6176434 or 4499699 ×14
  • Plate 1 x 2 Yellow Part 3023 Element 302324 ×4
  • Plate 1 x 4 Yellow Part 3710 Element 371024 ×2

Technic Connectors 54 pieces

  • Technic Axle Connector Ridged [with x Hole x Orientation] Black Part 6538b Element 4113805 or 4107083 ×7
  • Technic Axle Connector with Axle Hole Black Part 32039 Element 4107081 or 3203926 ×21
  • Technic Axle and Pin Connector Angled #1 Black Part 32013 Element 6284699 or 4107085 ×14
  • Technic Axle and Pin Connector Angled #2 - 180° Black Part 32034 Element 6271869 or 4107783 ×6
  • Technic Axle and Pin Connector Angled #3 - 157.5° Black Part 32016 Element 6261386 or 4107082 ×2
  • Technic Axle and Pin Connector Angled #5 - 112.5° Black Part 32015 Element 6271346 or 4107084 ×1
  • Technic Axle and Pin Connector Perpendicular 3L with Centre Pin Hole Red Part 32184 Element 6276963 or 4128598 ×3

Plates Special 49 pieces

  • Plate Special 2 x 2 with 2 Pin Holes Black Part 2817 Element 281726 ×9
  • Technic Plate 2 x 8 [7 Holes] Black Part 3738 Element 373826 ×4
  • Technic Plate 2 x 6 [5 Holes] Blue Part 32001 Element 4114027 or 3200123 ×1
  • Technic Plate 2 x 6 [5 Holes] Red Part 32001 Element 4582843 or 3200121 ×12
  • Technic Plate 2 x 4 [3 Holes] White Part 3709 Element 370901 ×2
  • Technic Plate 2 x 8 [7 Holes] White Part 3738 Element 4527945 or 373801 ×8
  • Technic Plate 2 x 4 [3 Holes] Yellow Part 3709 Element 370924 ×3
  • Technic Plate 2 x 8 [7 Holes] Yellow Part 3738 Element 4624216 or 373824 ×10

Technic Bricks 36 pieces

  • Technic Brick 1 x 2 with Axle Hole Type 2 [X Opening] Black Part 32064b ×6
  • Technic Brick 1 x 4 [3 Pin Holes] Black Part 3701 Element 370126 ×4
  • Technic Brick 1 x 6 [5 Pin Holes] Black Part 3894 Element 389426 ×1
  • Technic Brick 1 x 8 [7 Pin Holes] Black Part 3702 Element 370226 ×3
  • Technic Brick 1 x 8 [7 Pin Holes] Red Part 3702 Element 370221 ×12
  • Technic Brick 1 x 10 [9 Pin Holes] Yellow Part 2730 Element 4251460 or 4225500 ×2
  • Technic Brick 1 x 16 [15 Pin Holes] Yellow Part 3703 Element 370324 ×4
  • Technic Brick 1 x 4 [3 Pin Holes] Yellow Part 3701 Element 370124 ×4

Technic Pins 31 pieces

  • Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 ×9
  • Technic Axle Pin without Friction Ridges Lengthwise Light Gray Part 3749 Element 4184168 or 4154179 ×15
  • Technic Pin without Friction Ridges Lengthwise Light Gray Part 3673 Element 4184166 or 367302 ×7

Technic Beams 26 pieces

  • Technic Beam 1 x 3 Thin Light Gray Part 6632 Element 4107825 ×6
  • Technic Beam 1 x 5 Thin Light Gray Part 32017 Element 4106885 ×8
  • Technic Beam 1 x 4 Thin with Stud Connector Red Part 2825 Element 6392956 or 4227649 ×6
  • Technic Beam 3 x 3 L-Shape Thin Red Part 32056 Element 6609332 or 6271816 ×6

Bricks Sloped 11 pieces

  • Brick Sloped 33° 3 x 2 White Part 3298 Element 329801 ×5
  • Brick Sloped 33° 3 x 4 White Part 3297 Element 329701 ×6

String, Bands and Reels 9 pieces

  • Technic Rubber Belt Medium [24mm ID] [Round Cross Section] Blue Part 85544 ×2
  • Rubber Belt Small [15mm ID] [Round Cross Section] White Part 85543 Element 6699001 or 4580665 5 spares in the box ×7

Electronics 5 pieces

  • Motor Pulley, 9V Micromotor with axle hole Light Gray Part 2983 Element 298630 ×5

Plates Round Curved and Dishes 4 pieces

  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Blue Part 4032a Element 403223 ×2
  • Dish 4 x 4 Inverted [Radar] White Part 3960 Element 396001 ×2

Animals / Creatures 2 pieces

  • Animal, Bear / Polar Bear White Part 76147 Element 4116773 ×2

Technic Special 2 pieces

  • Technic Cam Light Gray Part 6575 Element 657502 ×2

Tiles 2 pieces

  • Tile 1 x 8 with Groove Yellow Part 4162 Element 6388482 or 4189400 ×2

Tubes and Hoses 2 pieces

  • Hose, Ribbed 7mm D. 9L / 7.2cm Black Part 78c09 Element 6443871 or 6420612 ×2

Non-System Parts 1 piece

  • Playmat, Arctic Impact [No Color/Any Color] Part upn0418 ×1

Minifigures 5 figures

  • Blue Torso, White Legs, Blue Arctic Hood Minifigure, checked as a whole figure ×5

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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