How many pieces are in the Reznor Knockdown Expansion Set?

Reznor Knockdown Expansion Set contains 862 pieces.

What age is the Reznor Knockdown Expansion Set recommended for?

This set is recommended for ages 8+.

When was the Reznor Knockdown Expansion Set released?

Reznor Knockdown Expansion Set was released in 2021.

LEGO Reznor Knockdown Expansion Set set 71390

1 / 10

🏛 Super Mario

Set #71390

Reznor Knockdown Expansion Set

The Reznor Knockdown Expansion Set brings a thrilling boss battle to your LEGO Super Mario world.

Before you buy

Who it's for: Ages 8+ · Intermediate build Ideal for LEGO Super Mario fans and those who enjoy interactive play sets.
Build: 862 pieces · about 4.5 hours Build time is an estimate.
Price: $69.99 list price · 8.1¢ per piece
Availability: Retired at LEGO

★★★☆☆ 3.9 community rating from 32 ratings

Fans appreciate the set's interactive features and the fun Reznor boss battle recreation. Some find the build slightly repetitive and wish the set included a more substantial level design.

$69.99

Best Price

$62.99

You Save

10% OFF

📝 Our Take

AI-assisted editorial summary, grounded in our LEGO database and public community discussions. How we use AI

The Reznor Knockdown Expansion Set brings a thrilling boss battle to your LEGO Super Mario world. This set perfectly captures the frantic energy of the Reznor fights, adding exciting interactive elements to the LEGO Mario experience.

This set is perfect for LEGO Super Mario fans of all ages looking to expand their interactive course. With its action-packed gameplay and engaging build, it offers hours of fun and creative challenges.

Skip this if you're not already invested in the LEGO Super Mario system. This is an expansion set, so you'll need a Starter Course to get the full interactive experience. Consider the Adventures with Mario Starter Course as a starting point.

✨ New

Ask BlockTalk about this set

AI assistant with full set data

BlockTalk

Hi! I'm BlockTalk, your LEGO expert. Ask me anything about the Reznor Knockdown Expansion Set - building tips, investment potential, comparisons, or anything else!

Try asking:

How does this expansion set enhance the LEGO Super Mario experience? What are the key interactive elements included in this set? How does the Reznor Knockdown Expansion Set compare to other Super Mario expansion sets in terms of play value? What's the best way to display this set as part of a larger LEGO Super Mario course?

🧱 Building Experience

AI-assisted build estimate, grounded in our LEGO database and public community discussions. How we use AI

🧩

862

Pieces

⏱

4.5h

Estimated Build Time

📊

Intermediate

Difficulty

📏

25cm × 56cm × 30cm

Dimensions

Build Highlights:

Rotating platforms recreate the Reznor boss battle.
Technic elements provide smooth and reliable functionality.
Incorporates interactive elements for LEGO Mario (figure not included).
Features a tilting platform and spinning elements for dynamic play.

📈 Investment Analysis

AI-assisted investment analysis, grounded in our LEGO database and public community discussions. How we use AI

↓ Price declining

Investment Grade

⏳ Retired

The Reznor Knockdown Expansion Set, being a retired LEGO Super Mario set, has potential for appreciation. The Super Mario theme is popular, and expansion sets often become desirable as collectors seek to complete their courses. However, its relatively recent retirement and moderate piece count suggest a gradual rather than rapid increase in value. Monitor its price trend and consider holding for long-term growth.

Not Financial Advice: Content is for educational purposes only. Past performance doesn't guarantee future results. Full disclaimer

⚖ Compare Similar Sets

Bowser's Castle Boss Battle Expansion Set

Super Mario • 1,010 pcs

$99.99

Boomer Bill Barrage Expansion Set

Super Mario • 132 pcs

$29.99

Lakitu Sky World Expansion Set

Super Mario • 484 pcs

$39.99

Compared to other LEGO Super Mario expansion sets, the Reznor Knockdown offers a unique boss battle experience. It's more complex than some of the smaller sets but less elaborate than larger castle-themed sets. If you're prioritizing interactive gameplay and action features, this set is a great choice. Consider 71369-1 Bowser's Castle Boss Battle Expansion Set for a similar scale and challenge.

📦 Parts Inventory

Official piece count: 862
Parts cataloged in this inventory: 189 unique parts, 862 pieces

Missing a piece? Check this set piece by piece, with look-alike colors flagged and element IDs for replacements.

Plate Special 2 x...

Part #: 10247 3× Black

Tile Special 2 x ...

Part #: 11203 1× Light Bluish Gray

Brick Special 1 x...

Part #: 11211 4× Red

Plate 3 x 3

Part #: 11212 1× Light Bluish Gray

Plate Round 6 x 6...

Part #: 11213 3× Medium Nougat

Bracket 5 x 2 x 1...

Part #: 11215 6× Light Bluish Gray

Plate Special 1 x...

Part #: 11458 4× Light Bluish Gray

Brick Curved 2 x ...

Part #: 11477 8× Light Bluish Gray

Brick Curved 2 x ...

Part #: 11477 4× Sand Green

Tile Round 2 x 2 ...

Part #: 14769 4× Black

Tile Round 2 x 2 ...

Part #: 14769 1× Blue

Tile Round 2 x 2 ...

Part #: 14769 1× Light Bluish Gray

Brick Curved 2 x ...

Part #: 15068 1× Light Bluish Gray

Brick Curved 2 x ...

Part #: 15068 2× Bright Green

Brick Curved 2 x ...

Part #: 15068 1× Red

Brick Curved 2 x ...

Part #: 15068pr0052 2× Light Bluish Gray

Plate Special 2 x...

Part #: 15092 1× Dark Bluish Gray

Technic Axle 5 wi...

Part #: 15462 1× Reddish Brown

Tile Special Roun...

Part #: 15535 8× Dark Bluish Gray

Plate Special 1 x...

Part #: 15573 2× Dark Bluish Gray

Plate Special 1 x...

Part #: 15573 1× White

Brick Sloped 45° ...

Part #: 15672 4× Light Bluish Gray

Brick Sloped 45° ...

Part #: 15672 4× Dark Bluish Gray

Brick Round 2 x 2...

Part #: 17485pr9999 1× Blue

Plate Round Half ...

Part #: 18646 1× Black

Plate Special 1 x...

Part #: 18649 2× Light Bluish Gray

Technic Axle Pin ...

Part #: 18651 1× Black

Technic Pin Conne...

Part #: 18654 1× White

Technic Pin Conne...

Part #: 18654 1× Dark Bluish Gray

Plate Special 1 x...

Part #: 18677 4× Red

Plate Special 1 x...

Part #: 18677 2× White

Fence Spindled 4 ...

Part #: 21229 1× Medium Nougat

Brick Sloped 45° ...

Part #: 22388 6× Tan

Brick Sloped 45° ...

Part #: 22388 2× Trans-Orange

Brick Special 1 x...

Part #: 22885 2× Tan

Brick Special 1 x...

Part #: 22885 6× Light Bluish Gray

Plate Round Half ...

Part #: 22888 2× Dark Bluish Gray

Brick 2 x 2 Corner

Part #: 2357 2× Dark Bluish Gray

Plate 2 x 2 Corner

Part #: 2420 5× Black

Brick Curved Inve...

Part #: 24201 6× Tan

Tile 1 x 4 with G...

Part #: 2431 3× Medium Nougat

Tile 1 x 4 with G...

Part #: 2431 2× Yellow

Tile 1 x 4 with G...

Part #: 2431 2× Black

Tile 1 x 4 with G...

Part #: 2431 4× Light Bluish Gray

Technic Axle 3 wi...

Part #: 24316 5× Reddish Brown

Wedge Plate 3 x 3...

Part #: 2450 2× Light Bluish Gray

Cylinder Half 2 x...

Part #: 24593 2× Light Bluish Gray

Plate Special 2 x...

Part #: 2476a 4× Dark Tan

Plant, Flower, Pl...

Part #: 24866 2× Medium Lavender

Tile Round 1 x 1 ...

Part #: 25269 8× Black

Tile Round 1 x 1 ...

Part #: 25269 4× Red

Plate Special 1 x...

Part #: 2540 2× Light Bluish Gray

Plate Special 2 x...

Part #: 26599 1× Light Bluish Gray

Wedge Plate 2 x 2...

Part #: 26601 6× Light Bluish Gray

Technic Disc 3 x 3

Part #: 2723 1× Black

Tile 4 x 4 Curved...

Part #: 27507 2× Light Bluish Gray

Tile 2 x 2 Curved...

Part #: 27925 8× Light Bluish Gray

Brick Sloped 45° ...

Part #: 28192 4× Light Bluish Gray

Brick Sloped 45° ...

Part #: 28192 4× Dark Bluish Gray

Arm, Short, with ...

Part #: 28660 2× Light Nougat

Brick Wedged, Cur...

Part #: 29119 4× Light Bluish Gray

Brick Wedged, Cur...

Part #: 29120 4× Light Bluish Gray

Brick 2 x 4

Part #: 3001 2× White

Brick 2 x 2

Part #: 3003 5× Light Bluish Gray

Brick 2 x 2 with ...

Part #: 3003pr0160 1× Light Nougat

Brick 1 x 2

Part #: 3004 1× Green

Brick 1 x 2

Part #: 3004 2× Bright Green

Brick 1 x 2

Part #: 3004 3× Dark Bluish Gray

Brick 1 x 2

Part #: 3004 2× Light Bluish Gray

Brick 1 x 2

Part #: 3004 1× Sand Green

Brick 1 x 2 with ...

Part #: 3004pr0075 1× Yellow

Brick 1 x 1

Part #: 3005 1× Dark Bluish Gray

Brick 1 x 1

Part #: 3005 2× Light Bluish Gray

Brick 1 x 8

Part #: 3008 1× Dark Bluish Gray

Brick 1 x 4

Part #: 3010 4× Dark Bluish Gray

Brick 1 x 4

Part #: 3010 1× Light Bluish Gray

Brick 1 x 4

Part #: 3010 1× Black

Brick Special 1 x...

Part #: 30136 2× Medium Nougat

Brick Special 1 x...

Part #: 30137 2× Medium Nougat

Plate 2 x 4

Part #: 3020 5× Black

Part #: 3020 8× Bright Green

Plate 2 x 4

Part #: 3020 3× Light Bluish Gray

Plate 2 x 3

Part #: 3021 8× Dark Bluish Gray

Plate 2 x 2

Part #: 3022 4× Light Bluish Gray

Plate 2 x 2

Part #: 3022 5× Green

Plate 2 x 2

Part #: 3022 2× Black

Plate 2 x 2

Part #: 3022 1× Blue

Plate 1 x 2

Part #: 3023 4× Yellow

Plate 1 x 2

Part #: 3023 6× Light Bluish Gray

Plate 1 x 2

Part #: 3023 9× Dark Brown

Plate 1 x 2

Part #: 3023 9× Dark Bluish Gray

Plate 1 x 2

Part #: 3023 27× Green

Plate 1 x 2

Part #: 3023 2× Red

Plate 1 x 1

Part #: 3024 2× Dark Bluish Gray

Plate 1 x 1

Part #: 3024 9× Olive Green

Plate 1 x 1

Part #: 3024 6× Tan

Plate 1 x 1

Part #: 3024 10× Light Bluish Gray

Plate 4 x 12

Part #: 3029 1× Dark Bluish Gray

Plate 2 x 8

Part #: 3034 2× Dark Bluish Gray

Plate 2 x 8

Part #: 3034 1× Black

Plate 2 x 8

Part #: 3034 2× Medium Nougat

Plate 4 x 8

Part #: 3035 1× Dark Bluish Gray

Brick Sloped 45° ...

Part #: 3039 1× Light Bluish Gray

Brick Sloped 45° ...

Part #: 3040b 4× Green

Brick Special 1 x...

Part #: 30414 1× White

Brick Sloped 45° ...

Part #: 3043 1× Black

Brick Sloped 45° ...

Part #: 3049d 2× Light Bluish Gray

Brick Round 1 x 1...

Part #: 3062b 13× Dark Bluish Gray

Brick Round 1 x 1...

Part #: 3062b 3× Black

Tile 2 x 2 with S...

Part #: 3068bpr0551 1× Yellow

Tile 2 x 2 with '...

Part #: 3068bpr9716 1× Yellow

Tile 2 x 2 with G...

Part #: 3068bpr9717 2× Red

Tile 2 x 2 with R...

Part #: 3068bpr9718 1× Light Bluish Gray

Tile 2 x 2 with R...

Part #: 3068bpr9719 1× Light Bluish Gray

Tile 2 x 2 with S...

Part #: 3068bpr9720 1× Blue

Tile 2 x 2 with '...

Part #: 3068bpr9990 1× Yellow

Tile 1 x 2 with G...

Part #: 3069b 6× Medium Nougat

Part #: 3069b 4× Black

Tile 1 x 2 with G...

Part #: 3069b 3× Bright Green

Tile 1 x 2 with G...

Part #: 3069b 1× Dark Bluish Gray

Tile 1 x 2 with G...

Part #: 3069b 2× Light Bluish Gray

Tile 1 x 2 with G...

Part #: 3069b 4× Yellow

Tile 1 x 1 with G...

Part #: 3070b 2× Dark Bluish Gray

Technic Brick 1 x...

Part #: 32000 1× White

Technic Brick 1 x...

Part #: 32000 2× Black

Technic Plate 2 x...

Part #: 32001 4× Light Bluish Gray

Technic Axle and ...

Part #: 32014 1× Black

Technic Brick 1 x...

Part #: 32064a 1× Green

Technic Brick 1 x...

Part #: 32064a 2× Yellow

Technic Bush 1/2 ...

Part #: 32123b 1× Yellow

Technic Bush 1/2 ...

Part #: 32123b 1× Light Bluish Gray

Technic Axle and ...

Part #: 32184 1× Yellow

Technic Gear 20 T...

Part #: 32198 1× Tan

Technic Beam 1 x ...

Part #: 32316 1× Black

Brick 1 x 2 x 2 w...

Part #: 3245c 3× Dark Bluish Gray

Technic Ball Joint

Part #: 32474 1× Bright Light Orange

Technic Ball Joint

Part #: 32474 1× Light Bluish Gray

Technic Beam 1 x ...

Part #: 32523 1× Black

Technic Beam 1 x ...

Part #: 32524 2× Dark Bluish Gray

Technic Beam 1 x ...

Part #: 32524 5× Black

Plant, Plate 1 x ...

Part #: 32607 2× Bright Green

Brick Curved Inve...

Part #: 32803 4× White

Brick Special 1 x...

Part #: 32952 3× Dark Bluish Gray

Brick Sloped 33° ...

Part #: 3297 1× Black

Plate Special 2 x...

Part #: 33909 2× White

Plate Special 2 x...

Part #: 33909 3× Red

Plate Special 2 x...

Part #: 33909 2× Light Bluish Gray

Plate 1 x 8

Part #: 3460 1× Black

Plate 1 x 8

Part #: 3460 1× Green

Plate Special 4 x...

Part #: 35443 4× Dark Bluish Gray

Plate Special 1 x...

Part #: 35480 3× Dark Bluish Gray

Plate Special 1 x...

Part #: 35480 4× Tan

Brick 1 x 3

Part #: 3622 2× Dark Bluish Gray

Plate 1 x 3

Part #: 3623 4× Dark Bluish Gray

Plate 1 x 3

Part #: 3623 4× Light Bluish Gray

Brick Sloped Inve...

Part #: 3660 1× Black

Brick Sloped Inve...

Part #: 3665 6× Dark Bluish Gray

Plate 1 x 6

Part #: 3666 8× Black

Plate 1 x 6

Part #: 3666 6× Light Bluish Gray

Plate 1 x 6

Part #: 3666 5× Dark Bluish Gray

Technic Pin witho...

Part #: 3673 12× Light Bluish Gray

Bracket 1 x 1 - 1...

Part #: 36841 4× Light Bluish Gray

Technic Brick 1 x...

Part #: 3700 1× Light Bluish Gray

Technic Brick 1 x...

Part #: 3700 1× Dark Bluish Gray

Technic Brick 1 x...

Part #: 3700 8× Black

Technic Brick 1 x...

Part #: 3701 1× Black

Technic Brick 1 x...

Part #: 3701 1× Light Bluish Gray

Technic Brick 1 x...

Part #: 3703 1× Dark Bluish Gray

Technic Plate 2 x...

Part #: 3709 1× Black

Technic Plate 2 x...

Part #: 3709 1× Dark Bluish Gray

Plate 1 x 4

Part #: 3710 6× Dark Bluish Gray

Plate 1 x 4

Part #: 3710 5× Light Bluish Gray

Plate 1 x 4

Part #: 3710 2× Tan

Technic Plate 2 x...

Part #: 3738 4× Medium Nougat

Wave / Flame Smal...

Part #: 37775 3× Trans-Orange

Plate 2 x 6

Part #: 3795 1× Medium Nougat

Plate 2 x 6

Part #: 3795 4× Light Bluish Gray

Plate 2 x 6

Part #: 3795 1× Blue

Plate 2 x 6

Part #: 3795 1× Dark Bluish Gray

Plate 2 x 10

Part #: 3832 5× Blue

Plate 2 x 10

Part #: 3832 1× Dark Bluish Gray

Plate 2 x 10

Part #: 3832 1× Light Bluish Gray

Technic Brick 1 x...

Part #: 3894 2× Black

Technic Brick 1 x...

Part #: 3894 2× Dark Bluish Gray

Hinge Brick 1 x 2...

Part #: 3937 1× Light Bluish Gray

Brick Round 2 x 2...

Part #: 3941 14× Black

Technic Pin Long ...

Part #: 39888 4× Tan

Plate Round 2 x 2...

Part #: 4032a 3× Yellow

Plate Round 2 x 2...

Part #: 4032a 2× Black

Plate Round 2 x 2...

Part #: 4032a 2× Medium Nougat

Plate Round 2 x 2...

Part #: 4032a 9× Light Bluish Gray

Plate Round 2 x 2...

Part #: 4032a 1× White

Technic Beam 1 x ...

Part #: 40490 2× Light Bluish Gray

Brick Special 1 x...

Part #: 4070 2× Bright Green

Tile 1 x 8 with G...

Part #: 4162 2× Blue

Plate Special 1 x...

Part #: 41740 3× Light Bluish Gray

Technic Pin 1/2 w...

Part #: 4274 3× Light Bluish Gray

Brick Sloped Inve...

Part #: 4287c 4× Light Bluish Gray

Technic Pin Long ...

Part #: 42924 1× Blue

Technic Axle Pin ...

Part #: 43093 3× Blue

Support Round 1 x...

Part #: 43888 2× Dark Bluish Gray

Bracket 1 x 2 - 2...

Part #: 44728 9× Black

Plate Special 1 x...

Part #: 44861 2× Light Bluish Gray

Brick Arch 1 x 3

Part #: 4490 4× Light Bluish Gray

Technic Axle Conn...

Part #: 45590 2× Black

Brick Curved 3 x ...

Part #: 50950 4× Light Bluish Gray

Brick Sloped 30° ...

Part #: 54200 2× Dark Bluish Gray

Brick Sloped 30° ...

Part #: 54200 7× Sand Green

Technic Axle 8 wi...

Part #: 55013 1× Dark Bluish Gray

Technic Tread Spr...

Part #: 57519 1× Light Bluish Gray

Plate Round Corne...

Part #: 6003 1× Dark Bluish Gray

Plate Round 4 x 4...

Part #: 60474 2× Dark Bluish Gray

Plate Special 1 x...

Part #: 60478 2× Light Bluish Gray

Technic Beam 3 x ...

Part #: 60484 1× Black

Window 1 x 2 x 2 ...

Part #: 60592 2× Tan

Brick Curved 2 x ...

Part #: 6081 2× Light Bluish Gray

Plate Special 1 x...

Part #: 60897 4× Tan

Brick 1 x 12

Part #: 6112 1× Dark Bluish Gray

Technic Pin with ...

Part #: 61332 12× Black

Hinge Brick 2 x 2...

Part #: 6134 1× Black

Plate Round 1 x 1...

Part #: 6141 8× Tan

Plate Round 1 x 1...

Part #: 6141 20× Dark Bluish Gray

Turntable 4 x 4 S...

Part #: 61485 5× Light Bluish Gray

Brick Round 4 x 4...

Part #: 6222 2× White

Technic Pin Conne...

Part #: 62462 1× White

Tile 1 x 3

Part #: 63864 2× Light Bluish Gray

Plate Special 1 x...

Part #: 63868 2× Light Bluish Gray

Technic Pin Long ...

Part #: 65304 2× Black

Technic Brick 1 x...

Part #: 6541 2× Dark Bluish Gray

Plate Special 2 x...

Part #: 65509 2× Dark Bluish Gray

Technic Axle 3 wi...

Part #: 6587 1× Dark Tan

Part #: 6636 1× Medium Nougat

Tile 1 x 6 with G...

Part #: 6636 5× Dark Bluish Gray

Pipe 6 x 6 (Warp ...

Part #: 66787 1× Yellow

Plate Round Corne...

Part #: 66789 1× Blue

Plate Round Corne...

Part #: 66789 1× Bright Green

Plate Round Corne...

Part #: 66789 1× Yellow

Plate Round Corne...

Part #: 66792 1× Bright Green

Plate Round Corne...

Part #: 66792 3× Blue

Plate Round Corne...

Part #: 66792 1× Light Bluish Gray

Plate Round Corne...

Part #: 66792 5× Medium Nougat

Plate Round Corne...

Part #: 66792 2× Black

Plate Round Corne...

Part #: 66792pr0125 2× Medium Nougat

Plate Round Corne...

Part #: 66792pr0127 1× Black

Brick Special Cub...

Part #: 66855pr0004 1× White

Technic Pin with ...

Part #: 66906 1× Red

Tile Round 3 x 3 ...

Part #: 67095pr0012 1× Light Bluish Gray

Tile 2 x 6

Part #: 69729 1× Light Bluish Gray

Tile 2 x 6

Part #: 69729 2× Dark Bluish Gray

Bracket 3 x 2 x 1...

Part #: 73562 2× Dark Bluish Gray

Bracket 1 x 1 - 1...

Part #: 73825 2× White

Plate 2 x 3 with ...

Part #: 73831 4× Dark Brown

Plate 2 x 3 with ...

Part #: 73831 2× Medium Nougat

Plate Round Corne...

Part #: 73832 1× Bright Green

Bracket 5 x 2 x 2...

Part #: 76766 2× Black

Plate Round Corne...

Part #: 79387 2× Yellow

Plate Round Corne...

Part #: 79387 2× Dark Bluish Gray

Bracket 1 x 1 - 1...

Part #: 79389 12× Light Bluish Gray

Tile 3 x 3 Curved...

Part #: 79393 4× Olive Green

Feet, 2 x 2 x 2/3...

Part #: 79750 1× Reddish Brown

Brick Round Corne...

Part #: 85080 8× Light Bluish Gray

Brick Sloped 30° ...

Part #: 85984 2× Black

Tile 2 x 4 with G...

Part #: 87079 2× Black

Tile 2 x 4 with G...

Part #: 87079 1× Tan

Technic Axle 4 wi...

Part #: 87083 4× Dark Bluish Gray

Plate Special 2 x...

Part #: 87580 1× Black

Plate Special 2 x...

Part #: 87580 1× Red

Plate Special 2 x...

Part #: 87580 2× Dark Bluish Gray

Plate 2 x 14

Part #: 91988 1× Dark Bluish Gray

Plate 2 x 14

Part #: 91988 3× Light Bluish Gray

Brick Arch 1 x 6 ...

Part #: 92950 2× Light Bluish Gray

Brick Curved 4 x ...

Part #: 93273 4× Light Bluish Gray

Brick and Axle Se...

Part #: 96874 1× Orange

Tile Round 1 x 1

Part #: 98138 5× Light Bluish Gray

Tile Round 1 x 1

Part #: 98138 1× Red

Tile Round 1 x 1

Part #: 98138 3× Dark Tan

Brick Special 1 x...

Part #: 98283 2× Light Bluish Gray

Bracket 1 x 2 - 2...

Part #: 99207 1× Yellow

Bracket 1 x 2 - 2...

Part #: 99207 11× Light Bluish Gray

The set features a good quantity of Light Bluish Gray and Dark Bluish Gray elements, useful for MOC builders needing neutral tones. The Olive Green plates offer a pop of color and are relatively uncommon.

Community Insights

Real opinions from Reddit and YouTube

What Reddit Says

No Reddit discussions found for this set.

What YouTubers Say

2 videos found

BlockTalk AI

BlueBrick33 praises the Reznor Knockdown Expansion Set's skewer function, noting its faithful recreation of the game mechanic and the value for the $70 price point. BrickMeisterZ highlights the unique yellow pipe with a 30-second timer and the set's Resnor ferris wheel mechanism.