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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.

Computer Science & AI Kit 6-8

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45522 Computer Science & AI Kit 6-8

367 pieces in 114 part and color combinations, plus 4 minifigures.

The official piece count includes the 12 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.

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Piece checklist

Plates Special 46 pieces

  • Plate Special 2 x 2 with Pin on Bottom Black Part 2476a Element 6328479 ×4
  • Plate Special 2 x 2 with Rubber Foot Black Part 109373 Element 6492701 ×4
  • Technic Plate 2 x 4 [3 Holes] Black Part 3709 Element 370926 ×4
  • Plate Special 1 x 4 x 2/3 with 1 x 2 Bottom Cutout Coral Part 7769 Element 6598033 ×4
  • Bracket 1 x 2 - 2 x 2 Dark Turquoise Part 44728 Element 6429966 or 6249425 ×2
  • Plate Special 1 x 4 with 2 Studs with Groove [New Underside] Dark Turquoise Part 41740 Element 6250120 ×4
  • Bracket 1 x 2 - 2 x 2 Inverted Light Bluish Gray Part 99207 Element 4654580 ×2
  • Plate Special 2 x 2 with 2 Pin Holes Light Bluish Gray Part 2817 Element 4211376 ×4
  • Plate Special 2 x 2 x 2/3 with Axle Hole and Grill on Sides (Haybale) Light Bluish Gray Part 71752 Element 6609654 ×4
  • Plate Special 2 x 4 with Pins, Reinforced Light Bluish Gray Part 40687 Element 6408542 ×2
  • Technic Plate 2 x 6 [5 Holes] Light Bluish Gray Part 32001 Element 4211542 ×4
  • Plate Special 1 x 2 with Three Teeth [Tri-Tooth] White Part 15208 Element 6046381 ×4
  • Technic Plate 2 x 8 [7 Holes] White Part 3738 Element 4527945 or 373801 ×4

Bricks 32 pieces

  • Brick 2 x 4 Blue Part 3001 Element 300173 or 300123 ×2
  • Brick 2 x 4 Bright Light Orange Part 3001 Element 6100027 or 4645053 ×2
  • Brick 2 x 2 Coral Part 3003 Element 6422920 ×4
  • Brick 2 x 2 Dark Turquoise Part 3003 Element 6314091 or 4120399 ×4
  • Brick 2 x 4 Dark Turquoise Part 3001 Element 6249422 or 6235115 ×2
  • Brick 2 x 4 Green Part 3001 Element 4106356 or 300128 ×2
  • Brick 2 x 6 Light Bluish Gray Part 2456 Element 4274668 or 4211795 ×2
  • Brick 2 x 4 Medium Lavender Part 3001 Element 6013583 or 4655173 ×2
  • Brick 2 x 4 Red Part 3001 Element 300121 ×2
  • Brick 1 x 4 without Bottom Tubes Trans-Clear Part 3066 Element 6518156 or 4238274 ×4
  • Brick 2 x 2 White Part 3003 Element 6552095 or 6548256 ×4
  • Brick 2 x 8 White Part 3007 Element 6619309 or 6033776 ×2

Technic Bricks 28 pieces

  • Technic Brick 1 x 16 [15 Pin Holes] Black Part 3703 Element 370326 ×2
  • Technic Brick 1 x 6 [5 Pin Holes] Black Part 3894 Element 389426 ×4
  • Technic Brick 5 x 5 Right Angle (1 x 4 - 1 x 4) Black Part 32555 Element 6170702 or 4529549 ×2
  • Technic Brick 1 x 2 with Axle Hole Type 1 [+ Opening] and Bottom Pin Coral Part 32064a Element 6439447 ×4
  • Technic Brick 1 x 2 [1 Pin Hole] Dark Turquoise Part 3700 Element 6345402 or 4140338 ×4
  • Technic Brick 1 x 8 [7 Pin Holes] Light Bluish Gray Part 3702 Element 4211442 ×4
  • Technic Brick 1 x 12 [11 Pin Holes] White Part 3895 Element 6332157 or 6215045 ×2
  • Technic Brick 1 x 4 [3 Pin Holes] White Part 3701 Element 6601913 or 370101 ×4
  • Technic Brick 5 x 6 Right Angle Double White Part 7469 Element 6548852 ×2

Bricks Special 26 pieces

  • Bracket 5 x 1 x 1 1/3 Black Part 5712 Element 6484901 ×4
  • Brick Special 2 x 2 with Pin and Axle Hole Black Part 6232 Element 6365577 or 6070692 ×4
  • Brick Special 2 x 4 with 3 Axle Holes Black Part 39789 Element 6244917 ×4
  • Brick Special 1 x 2 with 1 Center Stud on 1 Side, Bottom Stud Holder Light Bluish Gray Part 86876 Element 6383177 ×4
  • Brick Special 2 x 4, with 2 x 2 Brick with Top Pin and 1 x 2 Side Plates Light Bluish Gray Part 30592 Element 6301425 or 6278504 ×2
  • Brick Special 1 x 2 with Pin - Bottom Stud Holder White Part 44865 Element 6406522 ×4
  • Technic Brick 2 x 4 with 4 Pin Holes, 2 Pins White Part 112174 Element 6598035 ×4

Plates Round Curved and Dishes 24 pieces

  • Plate Round 2 x 2 with Rounded Bottom [Boat Stud] Black Part 2654 Element 4617551 or 4278359 ×4
  • Plate Round Corner 6 x 6 Black Part 6003 Element 6137779 or 4496676 ×4
  • Plate Round Corner 3 x 3 Dark Turquoise Part 30357 Element 6251838 ×2
  • Plate Round Corners 8 x 16 x 2/3 Circle with Reduced Knobs Dark Turquoise Part 5251 Element 6482578 ×2
  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Light Bluish Gray Part 4032a Element 4211475 ×4
  • Plate Round Corners 6 x 6 x 2/3 Circle with Reduced Knobs Light Bluish Gray Part 66789 Element 6299919 ×2
  • Plate Round 4 x 4 with Pin Hole White Part 60474 Element 6564904 or 4515347 ×2
  • Plate Round Corner 3 x 3 with 2 x 2 Round Cutout White Part 68568 Element 6552185 or 6339103 ×4

Technic Axles 24 pieces

  • Technic Axle 6 Black Part 3706 Element 370626 ×2
  • Technic Axle 5 Light Bluish Gray Part 32073 Element 32073194 or 4211639 ×4
  • Technic Axle 10 Red Part 3737 Element 6130005 or 4267858 ×2
  • Technic Axle 2 Notched Red Part 32062 Element 4142865 ×8
  • Technic Axle 4 Red Part 3705 Element 6129995 or 4265797 ×2
  • Technic Axle 3 Yellow Part 4519 Element 6130007 ×6

Technic Pins 24 pieces

  • Technic Axle Pin 3L with Friction Ridges Lengthwise and 2L Axle Black Part 18651 Element 6089119 ×4
  • Technic Pin with Friction Ridges Lengthwise with No Center Slots Black Part 61332 Element 6279875 ×8
  • Technic Pin without Friction Ridges Lengthwise Yellow Part 3673 Element 6331822 ×12

Bricks Round and Cones 22 pieces

  • Cone 1 x 1 [Top Groove] Dark Turquoise Part 59900 Element 6482735 ×8
  • Brick Round 4 x 4 with 4 Side Pin Holes and Center Axle Hole Light Bluish Gray Part 6222 Element 4211527 ×2
  • Brick Round 2 x 2 D. Tube with 45° Elbow and Axle Holes (Crossholes) at Each End [LONG] Trans-Clear Part 5489 Element 6611557 ×4
  • Brick Round 2 x 2 with Axle Hole Trans-Clear Part 3941 Element 6514281 or 6273152 ×4
  • Brick Round 2 x 2 x 3 D. Tube with Axle Holes (Crossholes) at Each End, Pin Holes In Sides White Part 7654 Element 6563271 ×4

Technic Gears 18 pieces

  • Technic Gear 12 Tooth Double Bevel Black Part 32270 Element 4177431 ×2
  • Technic Gear 36 Tooth Double Bevel Black Part 32498 Element 4255563 or 4177434 ×2
  • Gear Track Straight 3 x 16 Light Bluish Gray Part 7333 Element 6609687 ×2
  • Technic Gear 28 Tooth Double Bevel Light Bluish Gray Part 46372 Element 6259270 ×2
  • Technic Gear 20 Tooth Double Bevel with Axle Hole Type 1 [+ Opening] Tan Part 18575 Element 6346517 or 6084724 ×4
  • Gear Box 4 x 4 x 2 for Gear Track Trans-Clear Part 7332 Element 6598042 ×2
  • Gear Track Curve 90° 17 1/2 x 17 1/2 White Part 7334 Element 6598044 ×4

Plates 14 pieces

  • Plate 2 x 14 Black Part 91988 Element 6001494 ×2
  • Plate 2 x 4 Coral Part 3020 Element 6305455 ×4
  • Plate 2 x 12 Dark Turquoise Part 2445 Element 6453950 ×4
  • Plate 2 x 16 White Part 4282 Element 6609534 or 4119227 ×2
  • Plate 4 x 4 Corner White Part 2639 Element 6552129 or 4508662 ×2

Technic Connectors 14 pieces

  • Technic Pin Connector Plate 1 x 2 x 1 2/3 [Two Holes On Top] Black Part 32530 Element 4144024 ×2
  • Technic Axle Connector Smooth [with x Hole + Orientation] Coral Part 59443 Element 6544409 ×4
  • Technic Pin Connector Round 1L [Beam] Dark Turquoise Part 18654 Element 6295149 ×4
  • Technic Axle and Pin Connector Angled #1 White Part 32013 Element 6332573 or 4118981 ×4

Bricks Sloped 12 pieces

  • Brick Sloped Inverted 45° 2 x 1 Coral Part 3665 Element 6467785 ×4
  • Brick Sloped 33° 3 x 2 Dark Turquoise Part 3298 Element 6611552 or 6442379 ×4
  • Brick Sloped 45° 2 x 1 with Bottom Pin Trans-Clear Part 3040b Element 6507936 or 6277460 ×4

Tiles Round and Curved 12 pieces

  • Tile Round 2 x 4 Coral Part 66857 Element 6611550 ×4
  • Tile Round 2 x 2 with Black Circle, White Circles / Eye Print White Part 14769pr9967 Element 6522844 ×8

Bricks Curved 8 pieces

  • Brick Arch 1 x 6 x 2 Curved Top Dark Turquoise Part 6183 Element 6383990 ×4
  • Brick Curved 1 x 4 x 2 2/3 Trans-Clear Part 65734 Element 6510199 or 6288587 ×4

String, Bands and Reels 8 pieces

  • Chain 16L [21 Links] Light Bluish Gray Part 60169 Element 6292172 or 4512049 ×4
  • Technic Rubber Belt Extra Large [Round Cross Section] Light Bluish Gray Part 7336 Element 6598034 ×2
  • Technic Rubber Belt Medium [24mm ID] [Round Cross Section] Red Part 85544 Element 4544145 or 4544143 ×2

Technic Special 8 pieces

  • Pulley, 2-Stage Black Part 7335 Element 6598041 ×4
  • Technic Tooth 1 x 3 with Axle Hole [Hollow Underside] Black Part 48267 Element 6288220 ×4

Tiles Special 8 pieces

  • Tile Special Round 2 x 2 with Hole Dark Turquoise Part 15535 Element 6491435 ×4
  • Tile Special 2 x 2 with Top Pin [Squared Holes] White Part 49153 Element 6313138 ×4

Technic Beams 6 pieces

  • Technic Beam 1 x 3 Thick with Center Axle Hole Dark Turquoise Part 7229 Element 6549315 ×2
  • Technic Connector Beam 3 x 3 Dark Turquoise Part 39793 Element 6252655 ×2
  • Technic Beam 3 x 5 L-Shape Thick Light Bluish Gray Part 32526 Element 4211713 ×2

Tiles 6 pieces

  • Tile 2 x 6 Black Part 69729 Element 6318582 ×2
  • Tile 1 x 8 with Groove Dark Turquoise Part 4162 Element 6564698 ×4

Electronics 5 pieces

  • Control Unit / Remote Control, Science White Part 115901 Element 6666324 or 6586717 ×1
  • Motor 10 x 6 x 3, Science White Part 118091 Element 6669513 or 6610998 ×1
  • Motor 6 x 6 x 3, Science White Part 118084 Element 6666303 or 6610673 ×1
  • Sensor, Colour, Science White Part 118092 Element 6666299 or 6611005 ×1
  • USB Cable White Part 114253 Element 6554054 ×1

Technic Bushes 4 pieces

  • Technic Bush Light Bluish Gray Part 3713 Element 6275844 or 6271817 ×4

Tubes and Hoses 4 pieces

  • Axle Hose, Soft 11L Black Part 32199 Element 4234438 or 4121646 ×2
  • Axle Hose, Soft 7L White Part 32580 Element 6212046 ×2

Wheels and Tyres 4 pieces

  • Wheel Smooth 24 x 14mm with Pin Hole Black Part 5253 Element 6482581 ×2
  • Wheel with 4 Spokes with 2 Holes, 4 Inserts and Black Integral Tire Black Part 112175pat0001 Element 6598038 ×2

Gear Parts 2 pieces

  • Activity Card ? for Science Kits [No Color/Any Color] Part 119190 Element 6633001 ×2

Hinges, Arms and Turntables 2 pieces

  • Turntable 4 x 4 Square Base, Locking Light Bluish Gray Part 61485 Element 6045718 or 4523670 ×2

Plants & Trees 2 pieces

  • Plant, Leaf/Petal 4 x 6 x 1 1 / 3 White Part 7096 Element 6578921 ×2

Technic Beams Special 2 pieces

  • Technic Beam 3 x 5 Thick [90° Offset Centre Beam Holes] Black Part 14720 Element 6390379 ×2

Minifig Headwear 1 piece

  • Helmet, Sports, with Vent Holes [Plain] White Part 46303 Element 6139552 or 4198170 ×1

Tools 1 piece

  • Brick and Axle Separator v2.0 Dark Turquoise Part 96874 Element 6254100 ×1

Minifigures 4 figures

  • Monochrome Bright Green Minifigure, checked as a whole figure ×1
  • Monochrome Red, 28621 Head Minifigure, checked as a whole figure ×1
  • Monochrome Blue Minifigure, checked as a whole figure ×1
  • Monochrome Bright Light Orange, 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.