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Set 71390 Reznor Knockdown Expansion Set
Super Mario

Reznor Knockdown Expansion Set

The Reznor Knockdown Expansion Set adds a boss fortress to an existing LEGO Super Mario course, complete with the spinning platform familiar from Bowser's castle levels in the games. At 862 pieces and 285 distinct parts, it's one of the more detailed expansions in the range, though it ships without any minifigures since it relies on the electronic Mario or Luigi figure from a starter course. This page breaks down exactly what's inside, piece by piece and colour by colour.

Set number
71390
Year
2021
Pieces
862
Minifigures
0
Theme
Super Mario
Different parts
285
What can I build with it?

View the official building instructions at LEGO® ↗

Parts list 285

As BrickLink list (XML)

Import on BrickLink: Wanted → Upload, upload the file (or paste its content), pick a Wanted List and add the parts.

Description

A fortress, not a figure

Unlike most LEGO themes, this set skips minifigures entirely and instead delivers a multi-level fortress built in the style of Bowser's stages, topped with a rotating platform for the boss it's named after. Interaction comes from action bricks that trigger effects when the electronic Mario or Luigi figure rolls over them, rather than from posable characters. Owners of a starter course can connect this fortress straight onto their existing track to extend the run. Without a starter course, the model still builds fine as a display piece, but the interactive gameplay simply won't work - worth knowing before buying.

285 parts pack in a lot of detail

With 285 distinct parts out of 862 total pieces, the ratio of variety to bulk is fairly high, which points to an architecturally involved model rather than one built from lots of repeated elements. The colour palette backs that up: light bluish grey and dark bluish grey form the fortress stonework, black adds contrast at edges and mechanisms, and tan shows up in beam and trim details. Builders who enjoy detailed structures over figure-based scenes will find more variety here than in a simple straight track expansion.

Size compared with other expansions

Super Mario expansion sets typically sit in the small to mid-size range, and at 862 pieces this one lands near the top of that bracket. That makes it one of the larger add-ons in the line, with a build time to match rather than a quick single track piece. For collectors growing their course step by step, this is a set that delivers noticeably more visually and functionally than a basic straight or curved section. The full parts list on this page shows exactly which elements and colours are included before you decide to buy.

Who the expansion suits

This set is aimed squarely at existing LEGO Super Mario starter course owners who want to add a boss-fight section to their track. It's a poor fit for anyone without a starter course, since the interactive function is lost and only the build itself remains. Fans of the Bowser stages from the video games will recognise the fortress architecture and spinning platform immediately. Builders who value detailed structures over minifigures get a model in 71390 that slots well into a growing Super Mario collection.

FAQ

Does this set include minifigures?
No, set 71390 doesn't include any minifigures. It relies on the electronic Mario or Luigi figure from a starter course.
How many pieces does the Reznor Knockdown Expansion Set have?
The model contains 862 pieces with 285 distinct parts.
What colours dominate the fortress?
Light bluish grey and dark bluish grey form most of the stonework, with black and tan used for details.

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