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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.

Quantum Realm Explorers

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76109 Quantum Realm Explorers

187 pieces in 88 part and color combinations, plus 3 minifigures.

The official piece count includes the 13 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

Dark Bluish Gray 61 pieces

  • Barrel 2 x 2 x 2 Dark Bluish Gray Part 2489 Element 6278986 or 4218730 ×3
  • Brick 2 x 4 Dark Bluish Gray Part 3001 Element 4211085 ×1
  • Brick Curved 2 x 2 x 2/3 Two Studs and Curved Slope End Dark Bluish Gray Part 47457 Element 4218696 ×2
  • Brick Sloped 30° 1 x 2 x 2/3 Dark Bluish Gray Part 85984 Element 4567887 ×2
  • Brick Special 1 x 1 with Studs on 2 Sides Dark Bluish Gray Part 47905 Element 4213574 ×2
  • Brick Special 1 x 2 Palisade [aka Log] Dark Bluish Gray Part 30136 Element 4211095 ×2
  • Brick Special 1 x 2 with Vertical Clip [Open O Clip] Dark Bluish Gray Part 30237b Element 6335306 or 6127738 ×3
  • Brick Wedged, Curved 3 x 4 x 2/3 Cutout Dark Bluish Gray Part 11291 Element 6179677 or 6121295 ×1
  • Equipment Binoculars Dark Bluish Gray Part 30162 Element 4587887 or 4211051 ×4
  • Helicopter Skid Rails 12 x 6 Dark Bluish Gray Part 30248 Element 6259802 or 4546207 ×1
  • Hinge Brick 1 x 2 Base Dark Bluish Gray Part 3937 Element 4211066 ×4
  • Launcher Trigger, Weapon Gun Trigger Dark Bluish Gray Part 15392 Element 6051334 1 spare in the box ×2
  • Plate 1 x 3 Dark Bluish Gray Part 3623 Element 4211133 ×2
  • Plate 1 x 6 Dark Bluish Gray Part 3666 Element 4211056 ×2
  • Plate 2 x 4 Dark Bluish Gray Part 3020 Element 4211065 Also in Black ×3
  • Plate 4 x 6 Dark Bluish Gray Part 3032 Element 4211115 or 3032199 ×1
  • Plate Round 2 x 2 with Rounded Bottom [Boat Stud] Dark Bluish Gray Part 2654 Element 4613980 or 4278274 ×4
  • Plate Special 1 x 1 with Clip Vertical [Thick Open O Clip] Dark Bluish Gray Part 60897 Element 6489464 or 6296892 ×12
  • Plate Special 1 x 2 with End Towball Dark Bluish Gray Part 22890 Element 6370802 or 6338168 ×2
  • Plate Special 1 x 4 with 2 Studs, 3 Bottom Tubes Dark Bluish Gray Part 92593 Element 4598769 ×4
  • Technic Brick 1 x 2 [1 Pin Hole] Dark Bluish Gray Part 3700 Element 4211111 ×1
  • Tile 2 x 3 Dark Bluish Gray Part 26603 Element 6187008 ×1
  • Tile Special 1 x 1 with Clip with Rounded Edges Dark Bluish Gray Part 15712 Element 6344022 or 6071226 ×2

Light Bluish Gray 52 pieces

  • Bar 1 x 3 [Clip / Anti-Stud] Light Bluish Gray Part 4735 Element 4211644 ×2
  • Bar 1 x 6 [Closed Studs] Light Bluish Gray Part 6140 Element 6415608 or 4211524 ×1
  • Bracket 1 x 2 - 2 x 2 Inverted Light Bluish Gray Part 99207 Element 4654580 ×2
  • Brick Round 1 x 1 Open Stud Light Bluish Gray Part 3062b Element 4211412 ×2
  • Brick Round 2 x 2 [Grill] Light Bluish Gray Part 92947 Element 4650645 or 4610816 ×2
  • Brick Round 2 x 2, Pin Holes Light Bluish Gray Part 17485 Element 6372076 or 6078985 ×2
  • Brick Sloped 18° 4 x 1 Light Bluish Gray Part 60477 Element 6013497 ×2
  • Brick Sloped 45° 2 x 1 with 2/3 Cutout [New Version] Light Bluish Gray Part 15672 Element 6093859 ×2
  • Brick Special 1 x 2 with Grille Light Bluish Gray Part 2877 Element 4211383 ×2
  • Brick Wedged, Curved 2 x 1 with Stud Notch Left Light Bluish Gray Part 29120 Element 6225139 ×1
  • Brick Wedged, Curved 2 x 1 with Stud Notch Right Light Bluish Gray Part 29119 Element 6225142 ×1
  • Exhaust Pipe with Technic Pin - Flat End, Rounded Hole Light Bluish Gray Part 14682 Element 6044706 ×6
  • Hinge Cylinder 1 x 3 Locking with 1 Finger and 2 Fingers On Ends, with Hole, 9 Teeth Light Bluish Gray Part 30554b Element 4550251 or 4211663 ×2
  • Hinge Plate 2 x 2 Locking with 1 Finger on Top Light Bluish Gray Part 92582 Element 6265742 or 4666449 ×2
  • Launcher, Plate Special 1 x 2 with Mini Blaster Light Bluish Gray Part 15403 Element 6167514 ×2
  • Plate 2 x 8 Light Bluish Gray Part 3034 Element 4211406 ×1
  • Plate 4 x 12 Light Bluish Gray Part 3029 Element 4211401 ×1
  • Plate 4 x 4 Light Bluish Gray Part 3031 Element 4243797 or 4211403 ×1
  • Plate Special 1 x 2 5.9mm Centre Side Towball Socket Light Bluish Gray Part 14704 Element 6414561 or 6338165 ×2
  • Plate Special 1 x 2 with Door Rail Light Bluish Gray Part 32028 Element 4211568 ×4
  • Plate Special 1 x 2 with Handle on End [Closed Ends] Light Bluish Gray Part 60478 Element 4515369 ×2
  • Technic Brick 1 x 2 [1 Pin Hole] Light Bluish Gray Part 3700 Element 4211440 ×2
  • Technic Pin 1/2 without Friction Ridges Light Bluish Gray Part 4274 Element 4274194 or 4211483 1 spare in the box ×2
  • Tile 1 x 3 Light Bluish Gray Part 63864 Element 4558169 ×2
  • Tile 2 x 2 with Groove Light Bluish Gray Part 3068b Element 4211413 ×2
  • Windscreen 4 x 4 Roll Cage Light Bluish Gray Part 47758 Element 6231954 or 4249859 ×2

Black 33 pieces

  • Bar Holder with Clip Black Part 11090 Element 6315887 or 6015891 ×2
  • Bracket 1 x 2 - 2 x 4 Black Part 93274 Element 6118829 or 4616245 ×1
  • Brick Curved Inverted 2 x 1 Black Part 24201 Element 6147050 ×6
  • Brick Round 2 x 2 with Axle Hole Black Part 3941 Element 614376 or 614326 ×2
  • Lever Small Base with Black Lever Black Part 298c02 Element 73587 1 spare in the box ×2
  • Plate 2 x 4 Black Part 3020 Element 302026 Also in Dark Bluish Gray ×2
  • Plate 2 x 8 Black Part 3034 Element 303426 ×1
  • Plate Special 1 x 2 with Clip Horizontal on Side Black Part 11476 Element 6313116 or 6132731 ×1
  • Plate Special 2 x 2 x 2/3 with Two Studs On Side and Two Raised [Solid Anti-stud] Black Part 99206 Element 6052126 ×2
  • Plate Special 2 x 6 x 2/3 with 4 Studs on Side, 1 Support Wall on Bottom Black Part 87609 Element 4653049 ×2
  • Pneumatic T-Piece (T Bar) [New Style] Black Part 4697b Element 6104209 1 spare in the box ×2
  • Seat / Chair 2 x 2 with Center Sprue Mark Black Part 4079b Element 407926 ×1
  • Technic Brick 1 x 1 with Pin Hole Black Part 6541 Element 654126 ×4
  • Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 1 spare in the box ×1
  • Tile 2 x 2 with Groove Black Part 3068b Element 306826 ×1
  • Tile Special 1 x 2 Grille with Bottom Groove Black Part 2412b Element 241226 ×2
  • Tile Special Round 1 x 1 with Hollow Bar Black Part 20482 Element 6186675 or 6167933 1 spare in the box ×1

Flat Silver 16 pieces

  • Plate Round 1 x 1 with Solid Stud Flat Silver Part 6141 Element 4633691 1 spare in the box ×9
  • Sports Roller Skate Flat Silver Part 11253 Element 6215447 1 spare in the box ×4
  • Tile Round 1 x 1 with Silver Circle Print Flat Silver Part 98138pr0047 Element 6322905 or 6138964 1 spare in the box ×1
  • Tile Special 1 x 2 Grille with Bottom Groove Flat Silver Part 2412b Element 4619636 ×1
  • Weapon Gun Ray / Sci Fi - Rounded Heat Diffusers Flat Silver Part 13608 Element 6046398 ×1

Trans-Clear 8 pieces

  • Dish 2 x 2 Inverted [Radar] Trans-Clear Part 4740 Element 6514246 or 6245306 ×1
  • Dish 6 x 6 Inverted - No Studs with Handle Cockpit Print, Dark Red Patch Trans-Clear Part 18675pr0015 Element 6248889 or 6232248 ×2
  • Plate Round 1 x 1 with Solid Stud Trans-Clear Part 6141 Element 6514052 or 6240030 1 spare in the box ×4
  • Windscreen 6 x 6 x 3 Canopy Half Sphere with Dual 2 Fingers Trans-Clear Part 50747 Element 4624369 or 4530764 ×1

Dark Red 4 pieces

  • Brick Wedged, Curved 2 x 1 with Stud Notch Left Dark Red Part 29120 Element 6219658 ×1
  • Brick Wedged, Curved 2 x 1 with Stud Notch Right Dark Red Part 29119 Element 6219657 ×1
  • Tile 1 x 6 with Groove Dark Red Part 6636 Element 4650865 or 4163776 ×2

Pearl Gold 4 pieces

  • Bucket 1 x 1 x 1 Handle Pearl Gold Part 95344 Element 6245278 or 4654247 1 spare in the box ×1
  • Equipment Trophy Cup [Plain] Pearl Gold Part 89801 Element 6438123 or 6181993 ×1
  • Sports Roller Skate Pearl Gold Part 11253 Element 6132266 1 spare in the box ×2

Trans-Light Blue 4 pieces

  • Plate 1 x 2 Trans-Light Blue Part 3023 Element 6514007 or 6240222 ×2
  • Wave / Power Blast Rounded Energy with Bar Handle Trans-Light Blue Part 27393 Element 6581317 or 6353237 ×2

Dark Tan 2 pieces

  • Plate 1 x 4 Dark Tan Part 3710 Element 4626904 or 4497088 ×1
  • Plate 2 x 6 Dark Tan Part 3795 Element 4550329 ×1

Blue 1 piece

  • Technic Axle Pin with Friction Ridges Lengthwise Blue Part 43093 Element 4309323 or 4206482 ×1

Trans-Red 1 piece

  • Brick Round 1 x 1 Open Stud Trans-Red Part 3062b Element 6514235 or 6238673 ×1

[No Color/Any Color] 1 piece

  • Sticker Sheet for Set 76109-1 [No Color/Any Color] Part 39183 Element 6232246 ×1

Minifigures 3 figures

  • The Wasp (Hope van Dyne) with Trans-Medium Blue Wings Minifigure, checked as a whole figure ×1
  • Ant-Man (Scott Lang) (Ant-Man & The Wasp) Minifigure, checked as a whole figure ×1
  • Ghost (Ava Starr) 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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