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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.

Checking

70172 AntiMatter's Portal Hideout

452 pieces in 167 part and color combinations, plus 4 minifigures.

LEGO counts 475 pieces. This inventory comes from a separate parts catalog and lists 474, 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.

Every bag and the box. Shake out each bag, check its corners and seams, and look inside the empty box.
Inside what you have built. Small pieces lodge inside tubes, under plates and between studs. Turn the model over and look.
The last few steps. Compare each recent step with its parts callout. A piece used in the wrong place earlier leaves you one short later.
Look-alike colors. 3 parts in this set come in two colors that are easy to mix up; they are listed below.
The spare pieces. Many sets include a few extra small pieces. Check them before you order a replacement.
The floor and your building area. Check under furniture, the chair and the edges of your building surface.

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.

Brick Curved 2 x 1 No Studs [1/2 Bow] Black ×2 Dark Blue ×6 Black is yellower and darker than Dark Blue.
Plate Special 1 x 1 with Clip Horizontal [Thick Open O Clip] Black ×1 Dark Bluish Gray ×1 Black is darker than Dark Bluish Gray.
Technic Brick 1 x 2 [1 Pin Hole] Black ×2 Dark Bluish Gray ×4 Black is darker than Dark Bluish Gray.

Piece checklist

Technic Pins 43 pieces

Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole] Black Part 32054 Element 4140801 or 4107742 ×2
Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 ×19
Technic Pin with Friction Ridges Lengthwise and Towball Black Part 6628 Element 4184169 or 662826 ×3
Technic Axle Pin with Friction Ridges Lengthwise Blue Part 43093 Element 4309323 or 4206482 ×7
Technic Axle Towball Light Bluish Gray Part 2736 Element 6443149 or 4211375 ×1
Technic Pin 1/2 without Friction Ridges Light Bluish Gray Part 4274 Element 4274194 or 4211483 ×2
Technic Pin Double with Axle Hole Light Bluish Gray Part 32138 Element 4211888 ×8
Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole] Red Part 32054 Element 4140806 or 4125198 ×1

Bricks Sloped 33 pieces

Brick Sloped 33° 3 x 1 Black Part 4286 Element 428626 ×2
Brick Sloped Inverted 45° 6 x 4 Double with 4 x 4 Recessed and 3 Holes Black Part 60219 Element 4541984 ×1
Brick Sloped 18° 4 x 1 Dark Blue Part 60477 Element 6101304 ×4
Brick Sloped 45° 2 x 2 Dark Blue Part 3039 Element 4153653 ×2
Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Dark Blue Part 3660 Element 6025375 or 4590785 ×8
Brick Sloped 45° 2 x 1 with 2/3 Cutout [New Version] Dark Bluish Gray Part 15672 Element 6069164 or 4621917 ×2
Brick Sloped 45° 2 x 1 with Bottom Pin Dark Tan Part 3040b Element 4530678 or 4251973 ×12
Brick Sloped Inverted 33° 3 x 2, Connections between Studs, Ovoid Bottom Pin Light Bluish Gray Part 3747b Element 4211570 ×2

Technic Bricks 32 pieces

Technic Brick 1 x 10 [9 Pin Holes] Black Part 2730 Element 273026 ×4
Technic Brick 1 x 2 [1 Pin Hole] Black Part 3700 Element 370026 Also in Dark Bluish Gray ×2
Technic Brick 5 x 5 Right Angle (1 x 4 - 1 x 4) Black Part 32555 Element 6170702 or 4529549 ×4
Technic Brick 1 x 12 [11 Pin Holes] Blue Part 3895 Element 389523 ×4
Technic Brick 1 x 1 with Pin Hole Dark Bluish Gray Part 6541 Element 4210639 ×6
Technic Brick 1 x 2 [1 Pin Hole] Dark Bluish Gray Part 3700 Element 4211111 Also in Black ×4
Technic Brick 1 x 6 [5 Pin Holes] Dark Bluish Gray Part 3894 Element 4210917 or 3894199 ×1
Technic Brick 1 x 2 with Axle Hole Type 1 [+ Opening] and Bottom Pin Light Bluish Gray Part 32064a Element 6206249 or 4233493 ×6
Technic Brick 4 x 4 with 2 x 2 Opening Light Bluish Gray Part 32324 Element 4211640 ×1

Bricks Curved 23 pieces

Brick Curved 2 x 1 No Studs [1/2 Bow] Black Part 11477 Element 6047276 Also in Dark Blue ×2
Brick Curved 1 x 5 x 4 Inverted Dark Blue Part 30099 Element 6478109 or 6103771 ×4
Brick Curved 2 x 1 No Studs [1/2 Bow] Dark Blue Part 11477 Element 6554198 or 6094143 Also in Black ×6
Brick Curved 1 x 2 x 1 1/3 with Curved Top Dark Bluish Gray Part 6091 Element 6411327 or 4210797 ×2
Brick Curved 2 x 2, Two Top Studs Dark Bluish Gray Part 30165 Element 4211093 ×8
Brick Curved 2 x 4 x 1 1/3 White Part 6081 Element 608151 or 608101 ×1

Tiles 23 pieces

Tile 2 x 2 with Groove Dark Blue Part 3068b Element 4205004 ×9
Tile 1 x 2 with Groove Dark Tan Part 3069b Element 4496699 ×4
Tile 1 x 4 with Groove Light Bluish Gray Part 2431 Element 4211356 or 2431194 ×2
Tile 1 x 8 with Groove Light Bluish Gray Part 4162 Element 4211481 ×3
Tile 2 x 2 Corner Light Bluish Gray Part 14719 Element 6065824 ×2
Tile 1 x 1 with Dark Bluish Gray Square with Black Center and Lines Print (Ultra Chip) Trans-Green Part 3070bpr0001 Element 6254420 or 6083816 ×1
Tile 1 x 4 with Groove White Part 2431 Element 6548255 or 243101 ×1
Tile 2 x 2 with Minifigure, Arrow, Ruler and Molecule (Brainstein's Classified Notes) Print White Part 3068bpr0246 Element 6104200 ×1

Technic Axles 19 pieces

Technic Axle 8 with Stop Dark Bluish Gray Part 55013 Element 4499858 ×2
Technic Axle 3 with Stud Dark Tan Part 6587 Element 6031821 or 6013821 ×2
Technic Axle 5 Light Bluish Gray Part 32073 Element 32073194 or 4211639 ×1
Technic Axle 7 Light Bluish Gray Part 44294 Element 44294194 or 4211805 ×1
Technic Axle 2 Notched Red Part 32062 Element 4142865 ×13

Tiles Special 19 pieces

Tile Special 1 x 1 with Clip with Rounded Edges Black Part 15712 Element 6335388 or 6066102 ×5
Tile Special 1 x 2 Grille with Bottom Groove Dark Purple Part 2412b Element 4655690 or 4297453 ×11
Tile Special 1 x 2 Grille with Bottom Groove Flat Silver Part 2412b Element 4619636 ×2
Tile Special Round 2 x 2 with Hole Red Part 15535 Element 6102138 ×1

Minifig Upper Body 17 pieces

Arm Mechanical with Clip [Thick Support] Pearl Titanium Part 98313 Element 6276869 or 6008484 ×17

Bars, Ladders and Fences 16 pieces

Antenna 8H Whip Black Part 2569 Element 6265148 or 6164379 ×1
Bar 6L with Stop Ring Black Part 63965 Element 6170421 or 6081988 ×1
Lever Small Base with Black Lever Black Part 298c02 Element 73587 ×1
Plate Special 1 x 6 with Train Wagon End Fence Black Part 6583 Element 6271649 or 658326 ×2
Bar 1L with Clip [Cut Edges and One Side Hole] [Gap in Clip] Dark Bluish Gray Part 48729b Element 6278155 or 4579234 ×2
Bar 4L (Lightsaber Blade / Wand) Trans-Purple Part 30374 Element 6507883 or 6170191 ×9

Hinges, Arms and Turntables 15 pieces

Hinge Brick 1 x 2 Locking with 1 Finger Vertical End and 2 Fingers Vertical End, 9 Teeth Black Part 30386 Element 4167106 or 3038626 ×8
Hinge Brick 2 x 2 Top Plate Thin Black Part 6134 Element 4124096 or 613426 ×1
Hinge Cylinder 1 x 3 Locking with 1 Finger and Technic Friction Pin with Round Hole Black Part 41532 Element 4159335 ×1
Turntable 4 x 4 Square Base, Locking Black Part 61485 Element 4517986 ×1
Plate Special 4 x 6 with Trap Door Hinge [Long Pins] Dark Bluish Gray Part 92099 Element 4595710 ×2
Hinge Brick 1 x 2 Base Light Bluish Gray Part 3937 Element 4211469 ×1
Hinge Plate 1 x 2 Locking with 2 Fingers on Side, 9 Teeth Light Bluish Gray Part 60471 Element 4515341 ×1

Bricks Special 12 pieces

Brick Special 1 x 1 Studs on 4 Sides Black Part 4733 Element 473326 ×1
Brick Special 1 x 1 with Headlight Black Part 4070 Element 407026 ×1
Brick Special 1 x 1 with Stud on Side and Conductive Element on Opposite Side Black Part 15411 Element 6103777 or 6096747 ×4
Brick Special 1 x 2 with Grille Dark Bluish Gray Part 2877 Element 4210636 ×5
Brick Special 1 x 2 with Handle White Part 30236 Element 4140626 ×1

Bricks 11 pieces

Brick 1 x 1 x 5 with Solid Stud Dark Bluish Gray Part 2453b Element 4210690 ×2
Brick 1 x 12 Dark Bluish Gray Part 6112 Element 4210798 ×1
Brick 2 x 4 Dark Tan Part 3001 Element 4497066 or 4247145 ×2
Brick 1 x 1 Trans-Purple Part 3005 Element 6240552 or 6066120 ×6

Tiles Round and Curved 11 pieces

Tile Round 2 x 2 with Bottom Stud Holder Dark Bluish Gray Part 14769 Element 6056296 or 4620079 ×2
Tile Round 1 x 1 Trans-Light Blue Part 98138 Element 6514192 or 6274739 ×4
Tile Round 1 x 1 Trans-Purple Part 98138 Element 6514201 or 6325432 ×5

Technic Connectors 10 pieces

Technic Axle Connector with Axle Hole Black Part 32039 Element 4107081 or 3203926 ×1
Technic Axle and Pin Connector Toggle Joint Smooth Black Part 32126 Element 6457112 or 6322045 ×1
Technic Axle and Pin Connector Perpendicular Double Split Dark Bluish Gray Part 41678 Element 4234599 ×1
Technic Driving Ring Connector White Part 18948 Element 6276052 or 6100932 ×2
Technic Axle Connector Smooth [with x Hole + Orientation] Yellow Part 59443 Element 4519010 ×5

Projectiles / Launchers 6 pieces

Launcher Trigger, Weapon Gun Trigger Dark Bluish Gray Part 15392 Element 6051334 ×1
Launcher, Brick Special 1 x 4 Spring Shooter with Light Bluish Gray Top Dark Bluish Gray Part 15400 Element 6324200 or 6048898 ×1
Launcher, Large Figure Weapon, Zamor Sphere Launcher, Bottom with Axle Hole Pearl Titanium Part 98564 Element 6021670 or 4649272 ×2
Projectile, Bar 8L with Black Arrow End (Spring Shooter Dart) Trans-Orange Part 19020 Element 6097148 ×1
Launcher, Weapon Gun / Blaster / Shooter Mini White Part 15391 Element 6076599 ×1

Supports, Girders and Cranes 6 pieces

Support 1 x 6 x 10 Girder Triangular Dark Bluish Gray Part 64449 Element 4648252 ×4
Support 1 x 6 x 5 Girder Rectangular Dark Bluish Gray Part 64448 Element 4542618 ×2

Minifig Shields, Weapons, & Tools 5 pieces

Weapon Spear Gun with Squared Trigger and Thick Spear Base Black Part 13591 Element 6043130 ×1
Weapon Blade with Bar and 3 Spikes Pearl Titanium Part 19179 Element 6103924 ×3
Weapon Gun / Pistol Two Barrel, 10 Ribs White Part 95199 Element 6081466 ×1

Panels 5 pieces

Panel 1 x 6 x 5 Light Bluish Gray Part 59349 Element 4527174 ×2
Panel 4 x 4 x 6 Quarter Cylinder Light Bluish Gray Part 30562 Element 6310880 or 4631286 ×2
Panel 1 x 6 x 5 Trans-Purple Part 59349 Element 6245260 or 6096709 ×1

Technic Beams 4 pieces

Technic Beam 1 x 11 Thick Dark Bluish Gray Part 32525 Element 4603472 or 4534914 ×1
Technic Beam 1 x 3 Thin Dark Bluish Gray Part 6632 Element 6632199 or 6364452 ×2
Technic Beam 1 x 3 Thick White Part 32523 Element 6632140 or 4208160 ×1

Large Buildable Figures 3 pieces

Large Figure Weapon Claw, with Clip Pearl Titanium Part 92220 Element 4625376 ×3

Technic Bushes 3 pieces

Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced Light Bluish Gray Part 32123b Element 6271165 or 4211573 ×2
Technic Bush Red Part 3713 Element 6271820 or 4227155 ×1

Animal / Creature Body Parts 2 pieces

Animal Body Part, Shark Body with Gills and Gold Teeth Print (Sharkanator) Flat Silver Part 62605pr0002 Element 6122111 ×1
Animal Body Part, Shark Head with Gold Teeth, Rivets and '115' Print (Sharkanator) Flat Silver Part 62604pat0002 Element 6119446 ×1

Energy Effects 2 pieces

Wave / Flame Rounded Large with Marbled Dark Purple Pattern Trans-Purple Part 85959pat0005 Element 6118801 or 4651591 ×2

Technic Beams Special 2 pieces

Technic Beam 3 x 0.5 Liftarm with Boss and Pin / Crank Light Bluish Gray Part 33299a Element 4211688 ×2

Tubes and Hoses 2 pieces

Flexible Ribbed Hose 8mm Ends 19L with Blue Centre Pattern Trans-Clear Part 57539pat0004 Element 6044690 or 4614561 ×2

Windscreens and Fuselage 2 pieces

Windscreen 4 x 4 x 4 2/3 with Handle Trans-Light Blue Part 11289 Element 6280333 or 6019162 ×1
Dish 6 x 6 Inverted - No Studs with Handle with Silver and White Electricity Print Trans-Purple Part 18675pr0020 Element 6118903 ×1

Bricks Wedged 1 piece

Brick Wedged, Curved Inverted 10 x 6 x 2 Cockpit Black Part 47406 Element 4209683 ×1

Minifig Accessories 1 piece

Equipment Zip Line Handle Dark Bluish Gray Part 30229 Element 4211081 ×1

Plates Wedged 1 piece

Wedge Plate 3 x 4 with Stud Notches [Reinforced Underside] Black Part 90194 Element 6170529 or 6021504 ×1

Rock 1 piece

Rock 1 x 1 Jewel / Gem 24 Facet Trans-Purple Part 30153 Element 6513977 or 6247799 ×1

Stickers 1 piece

Sticker Sheet for Set 70172-1 [No Color/Any Color] Part 21618 Element 6117428 ×1

String, Bands and Reels 1 piece

String Cord Thin (0.5mm) 50cm Black Part 56823c50 Element 6530026 or 6489925 ×1

Tools 1 piece

Brick and Axle Separator v2.0 Orange Part 96874 Element 6240515 or 4654448 ×1

Transportation - Land 1 piece

Steering Wheel Small, 2 x 2 [Reinforced] Black Part 16091 Element 6057397 ×1

Minifigures 4 figures

AntiMatter Minifigure, checked as a whole figure ×1
Agent Solomon Blaze Minifigure, checked as a whole figure ×1
Sharx Minifigure, checked as a whole figure ×1
Agent Max Burns with Helmet and Shoulder Armor with White Arms 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.