LEGO Reznor Knockdown Expansion Set
Set #71390 · 2021 · 862 pieces · Advanced build
Set Details
- Set Number
- 71390
- Name
- Reznor Knockdown Expansion Set
- Theme
- Super Mario
- Year
- 2021
- Pieces
- 862
- Complexity
- Advanced
- Build Time
- 4-8 hours
- Ages
- 14+
- Type
- Both play and display
About LEGO Reznor Knockdown Expansion Set
LEGO Reznor Knockdown Expansion Set (set #71390) is a large, detailed build with 862 pieces from the Super Mario theme, released in 2021. The Super Mario line features interactive builds with electronic Mario figures and course elements. At 862 pieces, this is a advanced-level build with an estimated build time of 4-8 hours, suitable for ages 14+. As a licensed set, it recreates elements from the official Super Mario property.
Set Highlights
- 862 pieces at advanced complexity — a 4-8 hours build.
- Compatible with all standard LEGO sets — bricks extend naturally into other sets you own.
- Versatile build — display-worthy when complete, durable enough for active play.
- Officially licensed Super Mario set — faithful recreation of the source property.
Who Is This Set For?
Gift for Super Mario Fans
The natural overlap between Super Mario fans and LEGO fans makes this a go-to gift. The set brings recognizable characters and scenes into brick form.
Themed Play & Roleplay
Minifigures and themed accessories support imaginative play tied to the Super Mario universe — the play experience extends well beyond the initial build.
Collector's Display Piece
Many fans build licensed sets and display them complete. Limited or retired licensed releases often gain value over time, making them popular with serious collectors.
Build Tips
A five-minute sort by color or piece type before starting saves time hunting for specific bricks mid-step.
Follow the numbered steps in sequence — structural elements early in the build support everything that comes after.
For active play sets, key connection points (hinges, turntables, clip joints) can loosen over time — a small dab of LEGO's own tube clutch lubricant on the stud resolves most looseness without damage.
Finding Instructions
Building instructions for LEGO Reznor Knockdown Expansion Set (#71390) are available as a free PDF on LEGO.com. You can also upload a photo of this set to LegoFinder to identify it and access the instructions directly.
Reznor Knockdown Expansion Set FAQ
Related Reading
More Super Mario Sets
See all Super Mario →
Also Released in 2021
All 2021 sets →Similar Build Difficulty
Sets at roughly the same piece count and complexity tier — different theme and year, but a similar build experience.
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