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.
735 pieces in 263 part and color combinations, plus 8 minifigures.
LEGO counts 760 pieces. This inventory comes from a separate parts catalog and lists 763, including the 28 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.
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 1 x 2Black ×5Dark Bluish Gray ×4Black is darker than Dark Bluish Gray.
Plate 1 x 4Black ×4Dark Bluish Gray ×4Black is darker than Dark Bluish Gray.
Plate 2 x 4Black ×2Dark Bluish Gray ×5Black is darker than Dark Bluish Gray.
Tile Special 1 x 2 with HandleBlack ×2Dark Bluish Gray ×1Black is darker than Dark Bluish Gray.
Wedge Plate 4 x 4 with 2 x 2 CutoutDark Bluish GrayPart 43719Element 6430611 or 6275402×1
Blue
36 pieces
Brick 1 x 2BluePart 3004Element 4613959 or 300423×1
Plate 1 x 4BluePart 3710Element 371023×3
Plate 1 x 6BluePart 3666Element 366623×2
Plate Round 1 x 1 with Solid StudBluePart 6141Element 6141231 spare in the box×1
Projectile, Weapon Foam Dart with Black TipBluePart 58842Element 4501928×4
Technic Axle Pin with Friction Ridges LengthwiseBluePart 43093Element 4309323 or 4206482×17
Technic Brick 1 x 2 [1 Pin Hole]BluePart 3700Element 370023×2
Technic Pin 1/2 without Friction RidgesBluePart 4274Element 41430052 spares in the box×6
Orange
29 pieces
Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope)OrangePart 54200Element 4504371 or 4248195×2
Flexible Ribbed Hose 8mm Ends 19LOrangePart 57539Element 4561469 or 4508092×2
Launcher, Weapon, Four Barrel Foam Dart LauncherOrangePart 59492Element 4505526×1
Plate 1 x 2OrangePart 3023Element 4177932 or 4163009×1
Plate 1 x 4OrangePart 3710Element 4118782×2
Plate 2 x 4OrangePart 3020Element 4158355 or 4122468×5
Plate Special 1 x 2 Side Handle [Free Ends]OrangePart 2540Element 4190164 or 4163269×3
Technic Beam 2 x 4 L-Shape ThickOrangePart 32140Element 6271832 or 4508664×2
Tile Special 1 x 2 Grille with Bottom GrooveOrangePart 2412bElement 4125254 or 3933106×11
Trans-Dark Blue
22 pieces
Brick Round 1 x 1 Open StudTrans-Dark BluePart 3062bElement 6514233 or 6238044×5
Cone 1 x 1 [No Top Groove]Trans-Dark BluePart 4589Element 618843×11
Dish 2 x 2 Inverted [Radar]Trans-Dark BluePart 4740Element 6580383 or 6398233×6
Trans-Orange
21 pieces
Aero Tube 32 x 3 x 2 1/3Trans-OrangePart 23221Element 4505360×4
Cylinder 9 x 4 x 2 Tapered with Flat Bottom, Pin HolesTrans-OrangePart 58947Element 4502233×3
Panel 3 x 2 x 6Trans-OrangePart 2466Element 4507003×5
Plate Round 1 x 1 with Solid StudTrans-OrangePart 6141Element 6514059 or 62402273 spares in the box×7
Windscreen 7 x 4 x 2 RoundTrans-OrangePart 30384Element 4504623×2
Trans-Neon Green
20 pieces
Cone 1 x 1 [No Top Groove]Trans-Neon GreenPart 4589Element 618849 or 458949×6
Dish 2 x 2 Inverted [Radar]Trans-Neon GreenPart 4740Element 6245297 or 4112517×1
Rock 1 x 1 Jewel / Gem 24 FacetTrans-Neon GreenPart 30153Element 6247790 or 4114505×11
Tile Special 1 x 2 Grille with Bottom GrooveTrans-Neon GreenPart 2412bElement 4272661 or 4109766×2
Trans-Clear
9 pieces
Aero Tube Joiner 3 x 4 x 3Trans-ClearPart 30585bElement 4506997×8
Brick Round 2 x 2 x 1 2/3 Dome Top, Blocked Open StudTrans-ClearPart 30151aElement 4113949×1
Bright Green
4 pieces
Technic Rubber Belt Medium [24mm ID] [Round Cross Section]Bright GreenPart 85544×4
Yellow
4 pieces
Technic Bush 1/2 Smooth with Axle Hole Semi-ReducedYellowPart 32123bElement 6271167 or 32123241 spare in the box×4
Lime
3 pieces
Animal Body Part / Plant, Tail / Neck / Branch / Trunk, Middle Section with Pin, Round Pin HoleLimePart 40378Element 6290985 or 4650634×2
Hinge Plate 1 x 12 Locking with Angled Side Extensions and Tapered Ends, 7 TeethLimePart 57906Element 6448751 or 4656148×1
Trans-Red
3 pieces
Hinge Panel 2 x 4 x 3 1/3 Locking Dual 2 FingersTrans-RedPart 44572Element 4508663 or 4226965×1
Plate Round 1 x 1 with Solid StudTrans-RedPart 6141Element 6514051 or 62084501 spare in the box×2
Red
2 pieces
Animal Body Part, Barb / Claw / Tooth / Talon / Horn, SmallRedPart 53451Element 6270107 or 45683881 spare in the box×2
Tan
1 piece
Technic Axle Pin without Friction Ridges LengthwiseTanPart 3749Element 4666579 or 4186017×1
[No Color/Any Color]
1 piece
Sticker Sheet for Set 7690-1[No Color/Any Color]Part 59624Element 4506057×1
Minifigures
8 figures
MartianMinifigure, checked as a whole figure×4
Mars Astronaut, Cheek LinesMinifigure, checked as a whole figure×1
Mars Astronaut, Orange Sunglasses, StubbleMinifigure, checked as a whole figure×1
Mars Astronaut, 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.