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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.

Senior Solutions Challenge Kit

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9657 Senior Solutions Challenge Kit

1,612 pieces in 212 part and color combinations.

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 Pins 471 pieces

  • Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole] Black Part 32054 Element 4140801 or 4107742 ×10
  • Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 4 spares in the box ×268
  • Technic Axle Pin with Friction Ridges Lengthwise Blue Part 43093 Element 4309323 or 4206482 ×57
  • Technic Pin Long with Friction Ridges Lengthwise, 2 Center Slots Blue Part 6558 Element 4514553 ×121
  • Technic Pin Double with Axle Hole Light Bluish Gray Part 32138 Element 4211888 ×1
  • Technic Pin without Friction Ridges Lengthwise Light Bluish Gray Part 3673 Element 4211807 or 3673194 1 spare in the box ×7
  • Technic Axle Pin without Friction Ridges Lengthwise Tan Part 3749 Element 4666579 or 4186017 ×4
  • Technic Pin 3/4 Tan Part 32002 Element 6663097 or 6013938 1 spare in the box ×3

Tiles 225 pieces

  • Tile 1 x 2 with Groove Black Part 3069b Element 306926 ×4
  • Tile 1 x 6 with Groove Black Part 6636 Element 663626 ×4
  • Tile 2 x 4 with Groove Black Part 87079 Element 4560182 ×7
  • Tile 1 x 1 with Groove Blue Part 3070b Element 4206330 or 307073 ×32
  • Tile 2 x 2 with Groove Blue Part 3068b Element 306823 ×4
  • Tile 2 x 2 with Computer Monitor, White Power Switch Icon Print Dark Bluish Gray Part 3068bpr0095 ×1
  • Tile 1 x 2 with Groove Light Aqua Part 3069b Element 6133247 or 4619940 ×16
  • Tile 1 x 1 with Groove Medium Blue Part 3070b Element 4527526 or 4235958 1 spare in the box ×32
  • Tile 1 x 2 with Groove Medium Blue Part 3069b Element 4168345 ×16
  • Tile 1 x 1 with Groove Orange Part 3070b Element 4558595 or 4277770 1 spare in the box ×32
  • Tile 1 x 2 with Groove Orange Part 3069b Element 4188771 ×16
  • Tile 1 x 1 with Groove Red Part 3070b Element 307021 2 spares in the box ×32
  • Tile 2 x 2 with Groove Red Part 3068b Element 306821 ×4
  • Tile 1 x 1 with Groove White Part 3070b Element 6550138 or 307001 1 spare in the box ×1
  • Tile 1 x 6 with Groove White Part 6636 Element 6548296 or 663601 ×2
  • Tile 1 x 8 with Groove White Part 4162 Element 6552110 or 416201 ×2
  • Tile 2 x 4 with Groove White Part 87079 Element 6548271 or 4560178 ×4
  • Tile 1 x 2 with Groove Yellow Part 3069b Element 306924 ×16

Technic Beams 222 pieces

  • Technic Beam 1 x 11 Thick Black Part 32525 Element 6029578 or 4534909 ×5
  • Technic Beam 1 x 11.5 Double Bent Thick Black Part 32009 Element 6271152 or 4111998 ×2
  • Technic Beam 1 x 5 Thick Black Part 32316 Element 4142135 or 4140429 ×2
  • Technic Beam 1 x 9 Bent (6 - 4) Thick Black Part 6629 Element 6279881 or 4119800 ×5
  • Technic Beam 1 x 9 Thick Black Part 40490 Element 4645732 or 4542788 ×4
  • Technic Beam 3 x 3 T-Shape Thick Black Part 60484 Element 4552347 or 4535771 ×4
  • Technic Beam 3 x 5 L-Shape Thick Black Part 32526 Element 4142823 or 3252626 ×2
  • Technic Beam 1 x 11 Thick Red Part 32525 Element 4562805 or 4534913 ×2
  • Technic Beam 1 x 11.5 Double Bent Thick Red Part 32009 Element 6271160 or 4268653 ×12
  • Technic Beam 1 x 13 Thick Red Part 41239 Element 4522938 or 4262082 ×21
  • Technic Beam 1 x 15 Thick Red Part 32278 Element 4542575 or 4163147 ×5
  • Technic Beam 1 x 2 Thick Red Part 43857 Element 4185664 ×9
  • Technic Beam 1 x 2 Thin Red Part 41677 Element 6371442 or 4186678 ×4
  • Technic Beam 1 x 3 Thick Red Part 32523 Element 4153718 ×24
  • Technic Beam 1 x 4 Thin Red Part 32449 Element 6330205 or 4141811 ×6
  • Technic Beam 1 x 5 Thick Red Part 32316 Element 4142132 or 4128589 ×28
  • Technic Beam 1 x 7 Thick Red Part 32524 Element 4495933 or 4162098 ×9
  • Technic Beam 1 x 9 Bent (6 - 4) Thick Red Part 6629 Element 6534282 or 6394730 ×4
  • Technic Beam 1 x 9 Thick Red Part 40490 Element 4645733 or 4192225 ×11
  • Technic Beam 2 x 4 L-Shape Thick Red Part 32140 Element 6271827 or 4141270 ×10
  • Technic Beam 3 x 5 L-Shape Thick Red Part 32526 Element 4143154 ×14
  • Technic Beam 1 x 11 Thick White Part 32525 Element 6028103 or 4296265 ×5
  • Technic Beam 1 x 11.5 Double Bent Thick White Part 32009 Element 6271161 or 6004157 ×6
  • Technic Beam 1 x 13 Thick White Part 41239 Element 6634561 or 4620671 ×10
  • Technic Beam 1 x 3 Thick White Part 32523 Element 6632140 or 4208160 ×5
  • Technic Beam 1 x 5 Thick White Part 32316 Element 4249021 or 4140465 ×5
  • Technic Beam 1 x 9 Thick White Part 40490 Element 6001831 or 4156341 ×4
  • Technic Beam 3 x 5 L-Shape Thick White Part 32526 Element 6632144 or 4585040 ×4

Bricks 141 pieces

  • Brick 1 x 1 Black Part 3005 Element 300526 ×4
  • Brick 1 x 2 Black Part 3004 Element 300426 ×4
  • Brick 1 x 6 Black Part 3009 Element 300926 ×4
  • Brick 2 x 2 Corner Black Part 2357 Element 235776 or 235726 ×6
  • Brick 2 x 4 Black Part 3001 Element 300126 ×6
  • Brick 1 x 2 Blue Part 3004 Element 4613959 or 300423 ×1
  • Brick 1 x 4 Blue Part 3010 Element 301023 ×3
  • Brick 1 x 1 Green Part 3005 Element 300528 ×4
  • Brick 1 x 2 Green Part 3004 Element 4107736 or 300428 ×2
  • Brick 1 x 4 Green Part 3010 Element 4112838 or 301028 ×1
  • Brick 1 x 6 Green Part 3009 Element 4111844 or 300928 ×2
  • Brick 2 x 2 Green Part 3003 Element 300328 ×1
  • Brick 2 x 3 Green Part 3002 Element 4109674 or 300228 ×4
  • Brick 1 x 2 Light Bluish Gray Part 3004 Element 4211388 ×2
  • Brick 1 x 4 Light Bluish Gray Part 3010 Element 4211394 ×2
  • Brick 2 x 4 Light Bluish Gray Part 3001 Element 4211385 ×1
  • Brick 2 x 6 Light Bluish Gray Part 2456 Element 4274668 or 4211795 ×1
  • Brick 1 x 1 Orange Part 3005 Element 4173805 or 4119645 ×12
  • Brick 1 x 2 Orange Part 3004 Element 4613981 or 4121739 ×6
  • Brick 1 x 4 Orange Part 3010 Element 4118827 ×3
  • Brick 1 x 6 Orange Part 3009 Element 4189007 or 4162760 ×6
  • Brick 2 x 2 Orange Part 3003 Element 4153825 or 4119643 ×3
  • Brick 2 x 3 Orange Part 3002 Element 4153826 or 4125971 ×12
  • Brick 1 x 1 Tan Part 3005 Element 4113915 or 300505 ×4
  • Brick 2 x 3 Tan Part 3002 Element 4159739 or 300205 ×1
  • Brick 1 x 1 White Part 3005 Element 6552096 or 6548258 ×2
  • Brick 1 x 1 with Simple Black Eye with White Pupil Print White Part 3005pr0003 Element 4569080 ×2
  • Brick 1 x 3 White Part 3622 Element 6550143 or 362201 ×6
  • Brick 1 x 4 White Part 3010 Element 6550135 or 301001 ×13
  • Brick 1 x 6 White Part 3009 Element 6552097 or 6548259 ×11
  • Brick 1 x 8 White Part 3008 Element 6550134 or 300801 ×8
  • Brick 2 x 2 White Part 3003 Element 6552095 or 6548256 ×4

Plates 89 pieces

  • Plate 1 x 4 Black Part 3710 Element 371026 ×6
  • Plate 1 x 6 Black Part 3666 Element 366626 ×6
  • Plate 2 x 2 Black Part 3022 Element 302226 Also in Dark Bluish Gray ×4
  • Plate 2 x 2 Corner Black Part 2420 Element 242026 ×6
  • Plate 2 x 4 Black Part 3020 Element 302026 ×4
  • Plate 2 x 6 Black Part 3795 Element 379526 ×6
  • Plate 2 x 8 Black Part 3034 Element 303426 ×1
  • Plate 6 x 12 Black Part 3028 Element 302826 ×1
  • Plate 6 x 8 Black Part 3036 Element 303676 or 303626 ×3
  • Plate 1 x 2 Blue Part 3023 Element 302323 ×4
  • Plate 4 x 6 Blue Part 3032 Element 303223 ×1
  • Plate 6 x 6 Blue Part 3958 Element 4199519 or 395823 ×4
  • Plate 2 x 2 Dark Bluish Gray Part 3022 Element 4211094 Also in Black ×1
  • Plate 2 x 6 Green Part 3795 Element 379528 ×1
  • Plate 4 x 6 Light Bluish Gray Part 3032 Element 4211404 ×2
  • Plate 6 x 6 Light Bluish Gray Part 3958 Element 4211474 ×2
  • Plate 2 x 6 Orange Part 3795 Element 4121741 ×3
  • Plate 6 x 6 Red Part 3958 Element 4144302 ×4
  • Plate 6 x 6 Reddish Brown Part 3958 Element 4217848 ×4
  • Plate 1 x 1 Tan Part 3024 Element 4159553 or 302405 ×4
  • Plate 1 x 2 Tan Part 3023 Element 4113917 or 302305 ×2
  • Plate 1 x 4 Tan Part 3710 Element 4113233 or 371005 ×4
  • Plate 2 x 2 Tan Part 3022 Element 4114084 or 302205 ×2
  • Plate 2 x 6 Tan Part 3795 Element 4113993 or 379505 ×1
  • Plate 1 x 1 White Part 3024 Element 6548262 or 302401 ×5
  • Plate 1 x 4 White Part 3710 Element 6552108 or 6548266 ×3
  • Plate 2 x 10 White Part 3832 Element 6552109 or 383201 ×2
  • Plate 2 x 4 White Part 3020 Element 6552098 or 302001 ×2
  • Plate 8 x 8 White Part 41539 Element 4624911 or 4529687 ×1

Technic Axles 85 pieces

  • Technic Axle 10 Black Part 3737 Element 373726 ×9
  • Technic Axle 12 Black Part 3708 Element 370826 ×2
  • Technic Axle 4 Black Part 3705 Element 370526 ×7
  • Technic Axle 6 Black Part 3706 Element 370626 ×8
  • Technic Axle 8 Black Part 3707 Element 370726 ×2
  • Technic Axle 4 with Stop Dark Bluish Gray Part 87083 Element 6083620 or 4560177 ×2
  • Technic Axle 3 with Stud Dark Tan Part 6587 Element 6031821 or 6013821 ×4
  • Technic Axle 3 Light Bluish Gray Part 4519 Element 4211815 ×10
  • 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 ×8
  • Technic Axle 9 Light Bluish Gray Part 60485 Element 4535768 ×3
  • Technic Axle 2 Notched Red Part 32062 Element 4142865 ×29

Technic Connectors 80 pieces

  • Technic Axle Connector Smooth [with x Hole + Orientation] Black Part 59443 Element 6084612 or 4512363 ×7
  • Technic Axle and Pin Connector Angled #1 Black Part 32013 Element 6284699 or 4107085 ×8
  • Technic Axle and Pin Connector Angled #2 - 180° Black Part 32034 Element 6271869 or 4107783 ×5
  • Technic Axle and Pin Connector Angled #5 - 112.5° Black Part 32015 Element 6271346 or 4107084 ×4
  • Technic Axle and Pin Connector Perpendicular 3L with 2 Pin Holes Black Part 42003 Element 6273708 or 4200326 ×7
  • Technic Axle and Pin Connector Perpendicular Light Bluish Gray Part 6536 Element 6261375 or 4211775 ×1
  • Technic Axle and Pin Connector Toggle Joint Smooth Light Bluish Gray Part 32126 Element 4211575 ×2
  • Technic Pin Connector Hub Perpendicular 3L with 4 Pins Light Bluish Gray Part 48989 Element 4225033 ×2
  • Technic Pin Connector Hub with 2 Pins with Friction Ridges Lengthwise [Big Squared Pin Holes] Light Bluish Gray Part 87082 Element 4560175 ×2
  • Technic Axle Connector Smooth [with x Hole + Orientation] Red Part 59443 Element 4513174 ×11
  • Technic Axle Connector with Axle Hole Red Part 32039 Element 4118897 ×2
  • Technic Axle and Pin Connector Angled #2 - 180° Red Part 32034 Element 6351572 or 4234429 ×5
  • Technic Axle and Pin Connector Angled #6 - 90° Red Part 32014 Element 6268922 or 4189131 ×6
  • Technic Axle Connector Smooth [with x Hole + Orientation] Reddish Brown Part 59443 Element 4531751 ×10
  • Technic Axle and Pin Connector Angled #1 White Part 32013 Element 6332573 or 4118981 ×2
  • Technic Axle and Pin Connector Angled #6 - 90° White Part 32014 Element 6450588 or 6268926 ×4
  • Technic Pin Connector Round [Slotted] White Part 62462 Element 6550164 or 6173116 ×2

Bricks Round and Cones 44 pieces

  • Brick Round 1 x 1 Open Stud Green Part 3062b Element 306228 ×3
  • Brick Round 2 x 2 with Axle Hole Reddish Brown Part 3941 Element 4211166 ×4
  • Brick Round 4 x 4 with 4 Side Pin Holes and Center Axle Hole Reddish Brown Part 6222 Element 6177805 or 4223681 ×2
  • Brick Round 2 x 2 with Axle Hole Tan Part 3941 Element 4125220 or 614305 ×5
  • Brick Round 1 x 1 Open Stud White Part 3062b Element 6619283 or 306201 1 spare in the box ×18
  • Cone 2 x 2 x 2, Open Stud White Part 3942c Element 6044601 or 6022158 ×6
  • Brick Round 2 x 2 with Axle Hole Yellow Part 3941 Element 614324 or 394124 ×4
  • Cone 3 x 3 x 2 Yellow Part 6233 Element 6581918 or 4639063 ×2

Technic Panels 32 pieces

  • Technic Panel 5 x 11 x 1 Black Part 64782 Element 4566243 ×28
  • Technic Panel 5 x 11 x 1 White Part 64782 Element 6004135 or 4580019 ×4

Plants & Trees 28 pieces

  • Plant, Carrot Top Bright Green Part 33183 Element 4119479 1 spare in the box ×2
  • Plant, Flower 2 x 2 Leaves - Angular Bright Green Part 4727 Element 4143562 ×5
  • Plant, Flower, Plate Round 1 x 1 with 4 Petals Bright Light Orange Part 33291 Element 6170304 or 4624184 2 spares in the box ×8
  • Plant, Round 1 x 1 - 3 Bamboo Leaves Green Part 30176 Element 6270003 or 6248461 ×8
  • Plant, Carrot Orange Part 33172 Element 6424015 or 6103249 ×2
  • Plant, Flower 2 x 2 - Round [Open Stud] Red Part 4728 Element 472821 ×1
  • Plant, Flower 2 x 2 - Round [Open Stud] Yellow Part 4728 Element 472824 ×2

Technic Bushes 25 pieces

  • Technic Bush Light Bluish Gray Part 3713 Element 6275844 or 6271817 1 spare in the box ×17
  • Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced Light Bluish Gray Part 32123b Element 6271165 or 4211573 2 spares in the box ×8

Plates Round Curved and Dishes 22 pieces

  • Plate Round 1 x 1 with Solid Stud Red Part 6141 Element 614121 2 spares in the box ×12
  • Plate Round 1 x 1 with Solid Stud White Part 6141 Element 6601919 or 614101 2 spares in the box ×6
  • Plate Round Corner 4 x 4 White Part 30565 Element 4178429 ×4

Technic Bricks 21 pieces

  • Technic Brick 1 x 10 [9 Pin Holes] Black Part 2730 Element 273026 ×2
  • Technic Brick 1 x 8 [7 Pin Holes] Black Part 3702 Element 370226 ×2
  • Technic Brick 6 x 8 with 4 x 6 Opening Black Part 32532 Element 6448394 or 4188143 ×2
  • Technic Brick 1 x 6 [5 Pin Holes] Light Bluish Gray Part 3894 Element 4211466 ×4
  • Technic Brick 1 x 4 [3 Pin Holes] Red Part 3701 Element 370121 ×1
  • Technic Brick 1 x 2 [1 Pin Hole] White Part 3700 Element 6619284 or 370001 ×10

Wheels and Tyres 20 pieces

  • Tyre 14 x 9 Smooth Small Wide Slick Black Part 30028 Element 4508215 or 3002826 ×4
  • Tyre 30.4 x 14 VR Solid Black Part 58090 Element 6601610 or 4550937 ×3
  • Tyre 43.2 x 14 Offset Tread Black Part 56898 Element 6518544 or 4539268 ×2
  • Technic Wedge Belt Wheel [aka Pulley] Dark Bluish Gray Part 4185 Element 6321744 or 4587275 ×2
  • Wheel 18mm x 14mm with Axle Hole, Fake Bolts and Shallow Spokes Light Bluish Gray Part 55982 Element 4490127 ×3
  • Wheel 30 x 14 Light Bluish Gray Part 56904 Element 4541318 ×2
  • Wheel 8 x 9 with Hole Notched for Wheels Holder Pin, Re-inforced Back Light Bluish Gray Part 74967 Element 6011375 ×4

Technic Gears 17 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 ×4
  • Technic Knob Wheel Black Part 32072 Element 6284188 or 4248204 ×5
  • Technic Gear 24 Tooth [New Style with Single Axle Hole] Dark Bluish Gray Part 3648b Element 6133119 or 4514558 ×2
  • Technic Gear 8 Tooth Dark Bluish Gray Part 3647 Element 4514559 1 spare in the box ×2
  • Technic Gear 40 Tooth Light Bluish Gray Part 3649 Element 6195314 or 4285634 ×2

Bars, Ladders and Fences 16 pieces

  • Bar 4L (Lightsaber Blade / Wand) Black Part 30374 Element 6116604 or 4140303 ×2
  • Bar 6L with Stop Ring Black Part 63965 Element 6170421 or 6081988 ×5
  • Light Cover 1 x 1 Round with Internal Bar / Bionicle Barraki Eye Trans-Bright Green Part 58176 Element 6507869 or 6171864 ×6
  • Light Cover 1 x 1 Round with Internal Bar / Bionicle Barraki Eye Trans-Red Part 58176 Element 6507867 or 6171762 ×3

Bricks Sloped 14 pieces

  • Brick Sloped 18° 4 x 2 Black Part 30363 Element 4185583 ×2
  • Brick Sloped 45° 2 x 2 Green Part 3039 Element 303928 ×2
  • Brick Sloped 45° 2 x 2 Orange Part 3039 Element 4118828 ×6
  • Brick Sloped 45° 2 x 1 with Bottom Pin Tan Part 3040b Element 4121972 or 4113989 ×4

Technic Beams Special 12 pieces

  • Technic Beam 3 x 0.5 Liftarm with Boss and Pin / Crank Light Bluish Gray Part 33299a Element 4211688 ×11
  • Technic Beam Frame 5 x 7 with 3 x 5 Opening Thick Light Bluish Gray Part 64179 Element 4539880 ×1

Tubes and Hoses 12 pieces

  • Hose, Ribbed 7mm D. 9L / 7.2cm Black Part 78c09 Element 6443871 or 6420612 ×12

Technic Special 10 pieces

  • Ball, Hard Plastic, 51mm (approx. 6 studs diameter) Blue Part 41250 Element 4100758 ×3
  • Ball, Hard Plastic, 51mm (approx. 6 studs diameter) Red Part 41250 Element 4156530 ×3
  • Technic Plate 1 x 5 with Smooth Ends, 4 Studs and Centre Axle Hole White Part 32124 Element 6280386 or 4527839 ×2
  • Ball, Hard Plastic, 51mm (approx. 6 studs diameter) Yellow Part 41250 Element 6100937 or 4143294 ×2

Tiles Round and Curved 8 pieces

  • Tile Round 2 x 2 with Bottom Cross Black Part 4150 Element 415076 or 415026 ×6
  • Tile Round 2 x 2 with Bottom Cross Red Part 4150 Element 415071 or 415021 ×2

Bricks Special 6 pieces

  • Brick Special 1 x 1 with Stud on 1 Side Tan Part 87087 Element 4579260 ×2
  • Brick Special 1 x 2 with Studs on 2 Sides White Part 52107 Element 6548274 or 4667575 ×4

Plates Special 3 pieces

  • Plate Special 1 x 2 with Bar Up [Horizontal Arm 5mm] Black Part 88072 Element 6261348 or 4569733 ×1
  • Plate Special 2 x 2 with Wheel Holders Black Part 4600 Element 460026 ×2

Flags, Banners and Signs 2 pieces

  • Flag 2 x 2 Square, Flat Clip Edge [Thick Clips] Red Part 11055 Element 6011814 ×2

Plates Wedged 2 pieces

  • Wedge Plate 2 x 4 Blue Part 51739 Element 4609454 ×2

Technic Steering, Suspension and Engine 2 pieces

  • Technic Universal Joint 3L [Complete Assembly] Light Bluish Gray Part 61903 Element 6335279 or 6321309 ×2

Containers 1 piece

  • Container Box 2 x 2 x 2 - Top Opening Reddish Brown Part 61780 Element 4520638 ×1

Large Buildable Figures 1 piece

  • Large Figure Weapon Ammo, Flexible Ammunition Belt Black Part 98567 Element 4652060 ×1

Minifig Accessories 1 piece

  • Equipment Pitchfork / Fork, Flat End [Soft] Reddish Brown Part 95345 Element 6270119 or 4624905 ×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

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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.

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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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