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.
616 pieces in 184 part and color combinations, plus 5 minifigures.
The official piece count includes the 19 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.
Plate 2 x 8Black ×1Dark Bluish Gray ×13Black is darker than Dark Bluish Gray.
Technic Axle and Pin Connector Angled #1Black ×5Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Wedge Plate 4 x 4 Cut CornerBlack ×2Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Technic BushRedPart 3713Element 6271820 or 42271553 spares in the box×28
Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole]RedPart 32054Element 4140806 or 4125198×6
Orange
29 pieces
Brick Sloped 45° 2 x 1 with Bottom PinOrangePart 3040bElement 4121967 or 4118901×2
Flexible Ribbed Hose 8mm Ends 19LOrangePart 57539Element 4561469 or 4508092×1
Plate 1 x 2OrangePart 3023Element 4177932 or 4163009×9
Tile Special 1 x 2 Grille with Bottom GrooveOrangePart 2412bElement 4125254 or 3933106×9
Wheel Hard Plastic Giant (71mm D. x 47mm)OrangePart 2573Element 4508724×6
Wheel Hard Plastic Small (22mm D. x 24mm)OrangePart 6118Element 4505861×2
Blue
24 pieces
Technic Axle Pin with Friction Ridges LengthwiseBluePart 43093Element 4309323 or 4206482×11
Technic Beam 1 x 7 Bent (4 - 4) ThickBluePart 32348Element 6345498 or 6302340×2
Technic Pin 1/2 without Friction RidgesBluePart 4274Element 41430053 spares in the box×11
Yellow
18 pieces
Technic Brick 1 x 2 with Axle Hole Type 2 [X Opening]YellowPart 32064b×4
Technic Bush 1/2 Smooth with Axle Hole Semi-ReducedYellowPart 32123bElement 6271167 or 32123242 spares in the box×14
Trans-Neon Green
14 pieces
Cone 1 x 1 [No Top Groove]Trans-Neon GreenPart 4589Element 618849 or 458949×8
Rock 1 x 1 Jewel / Gem 24 FacetTrans-Neon GreenPart 30153Element 6247790 or 4114505×6
Trans-Orange
13 pieces
Cylinder 9 x 4 x 2 Tapered with Flat Bottom, Pin HolesTrans-OrangePart 58947Element 4502233×2
Panel 3 x 2 x 6Trans-OrangePart 2466Element 4507003×1
Plate Round 1 x 1 with Solid StudTrans-OrangePart 6141Element 6514059 or 62402273 spares in the box×8
Windscreen 10 x 6 x 2 CurvedTrans-OrangePart 45705Element 6507926 or 6386002×2
Trans-Dark Blue
12 pieces
Cone 1 x 1 [No Top Groove]Trans-Dark BluePart 4589Element 618843×6
Plate Round 1 x 1 with Solid StudTrans-Dark BluePart 6141Element 6514055 or 62402141 spare in the box×2
Tile 1 x 2 with GrooveTrans-Dark BluePart 3069bElement 6514219 or 6251289×4
Pearl Light Gray
6 pieces
Hose, Ribbed 7mm D. 4L / 3.2cmPearl Light GrayPart 78c04Element 4495200 or 42753891 spare in the box×6
Lime
3 pieces
Animal Body Part / Plant, Tail / Claw / Horn / Branch / Tentacle, End SectionLimePart 40379Element 6293393 or 6172469×2
Hinge Plate 1 x 12 Locking with Angled Side Extensions and Tapered Ends, 7 TeethLimePart 57906Element 6448751 or 4656148×1
Trans-Medium Blue
3 pieces
Projectile, Large Figure Weapon, Zamor Sphere / BallTrans-Medium BluePart 54821Element 4585759 or 4296577×3
Pearl Dark Gray
1 piece
Large Figure Weapon, Zamor Sphere LauncherPearl Dark GrayPart 54271Element 4288099×1
[No Color/Any Color]
1 piece
Sticker Sheet for Set 7699-1[No Color/Any Color]Part 60184Element 4508874×1
Minifigures
5 figures
MartianMinifigure, checked as a whole figure×2
Mars Astronaut, Orange Sunglasses, StubbleMinifigure, checked as a whole figure×1
Mars Astronaut, Stubble, Printed HairMinifigure, checked as a whole figure×1
Mars Astronaut, Stubble, Printed Hair over EyesMinifigure, 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.
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.