Level One - Kits 1-3 (20212-1) is a Master Builder Academy LEGO set released in 2012 with 383 pieces. Browse the parts list, minifigures, and verify loose bricks with our free scanner. Collectors browsing Master Builder Academy sets use this inventory to verify loose parts, compare color variants, and read official build manuals without downloading PDFs. This set includes 117 unique part types.
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Buying checklist
Quick context before you buy this set used or verify a marketplace listing.
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Release year
2012 (14 years ago — may be retired)
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Catalog scale
383 parts listed · 117 inventory lines tracked
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Minifigures
No minifigs in inventory (brick-only or Technic set)
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Build manual
No digital manual in our catalog — check the box tab or LEGO.com
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Shipping weight (est.)
~624 g for parts inventory (excludes box/minifig packaging)
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Before you buy used
Run the completion checker, compare photos to the inventory, and check live listings for sealed pricing
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Market value
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Parts in this set
117 parts · page 1 of 3 · updating…
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Antenna 1 x 4 with Rounded Top3957a · ×1 · Trans-Neon Green -
Antenna 1 x 4 with Rounded Top3957a · ×2 · Metallic Silver -
Bar 1 x 8 with Brick 1 x 2 Curved Top End (Axle Holder Inside Small End)30359b · ×4 · Black -
Bracket 1 x 2 - 2 x 244728 · ×5 · Black -
Bracket 5 x 2 x 2 1/3 with Holes, Smooth Bottom6087 · ×2 · Light Bluish Gray -
Brick 1 x 13005 · ×1 · White -
Brick 1 x 23004 · ×1 · Light Bluish Gray -
Brick Arch 1 x 3 x 2 Curved Top6005 · ×2 · Black -
Brick Curved 1 x 2 x 1 1/3 with Curved Top6091 · ×4 · Lime -
Brick Curved 1 x 4 x 1 1/3 No Studs10314 · ×2 · White -
Brick Curved 2 x 2 with Lip, No Studs30602 · ×1 · Trans-Brown -
Brick Curved 3 x 1 No Studs50950 · ×3 · Lime -
![Brick Curved 4 x 1 No Studs [Stud Holder with Symmetric Ridges]](https://cdn.rebrickable.com/media/parts/elements/6033782.jpg)
Brick Curved 4 x 1 No Studs [Stud Holder with Symmetric Ridges]11153 · ×4 · Lime -
Brick Round 1 x 1 Open Stud3062b · ×4 · White -
Brick Round 1 x 1 Open Stud3062b · ×6 · Black -
Brick Round 1 x 1 Open Stud3062b · ×4 · Green -
Brick Round 2 x 2 Dome Top, Hollow Stud30367c · ×2 · Black -
Brick Sloped 18° 2 x 1 x 2/3 with 4 Slots / Grate61409 · ×2 · Lime -
Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope)54200 · ×2 · Light Bluish Gray -
Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope)54200 · ×6 · Black -
Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope)54200 · ×2 · Dark Purple -
Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope)54200 · ×10 · Lime -
Brick Sloped 45° 2 x 1 with Bottom Pin3040b · ×2 · Black -
Brick Sloped 45° 2 x 2 Double Convex3045 · ×4 · Light Bluish Gray -
Brick Sloped 65° 2 x 1 x 260481 · ×2 · White -
Brick Sloped 65° 2 x 1 x 260481 · ×2 · Black -
Brick Sloped Inverted 34° 3 x 1 with Internal Stopper4287b · ×2 · Light Bluish Gray -
![Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes]](https://cdn.rebrickable.com/media/parts/elements/366026.jpg)
Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes]3660 · ×2 · Black -
![Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes]](https://cdn.rebrickable.com/media/parts/elements/366001.jpg)
Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes]3660 · ×1 · White -
![Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes]](https://cdn.rebrickable.com/media/parts/elements/4211436.jpg)
Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes]3660 · ×1 · Light Bluish Gray -
Brick Special 1 x 1 Studs on 4 Sides4733 · ×1 · White -
Brick Special 1 x 1 Studs on 4 Sides4733 · ×1 · Black -
Brick Special 1 x 2 with Handle30236 · ×2 · White -
Brick Wedged, Angled 3 x 2 Left6565 · ×1 · Black -
Brick Wedged, Angled 3 x 2 Right6564 · ×1 · Black -
Brick Wedged, Curved 6 x 2 Left, Inner Ridges41748 · ×1 · Black -
Brick Wedged, Curved 6 x 2 Right, Inner Ridges41747 · ×1 · Black -
![Cone 1 x 1 [Top Groove]](https://cdn.rebrickable.com/media/parts/elements/6051385.jpg)
Cone 1 x 1 [Top Groove]59900 · ×6 · Metallic Silver -
![Cone 1 x 1 [Top Groove]](https://cdn.rebrickable.com/media/parts/elements/4518400.jpg)
Cone 1 x 1 [Top Groove]59900 · ×1 · White -
![Dish 2 x 2 Inverted [Radar]](https://cdn.rebrickable.com/media/parts/elements/474026.jpg)
Dish 2 x 2 Inverted [Radar]4740 · ×2 · Black -
Equipment Magnifying Glass with Thick Frame, Solid Handle, Trans-Clear Lens10830pat0001 · ×1 · Black -
Hat / Cap Short Curved Peak86035 · ×1 · White -
Headwear Accessory Visor with Horizontal Slit87777 · ×1 · Metallic Silver -
Helmet, Standard2446 · ×1 · Flat Silver -
Hinge Plate 1 x 2 Locking with 1 Finger on Side, with Groove44567a · ×2 · Light Bluish Gray -
![Hinge Plate 1 x 4 Swivel Top / Base - Solid Clip [Complete Assembly]](https://cdn.rebrickable.com/media/parts/elements/6102782.jpg)
Hinge Plate 1 x 4 Swivel Top / Base - Solid Clip [Complete Assembly]73983 · ×4 · Black -
Hinge Plate 1 x 8 Locking with Angled Side Extensions, Rounded Plate Underside, 9 Teeth30407 · ×2 · Black -
Hips and Lime Legs970c18 · ×2 · White