Set Details
- Set Number
- 21137
- Name
- The Mountain Cave
- Theme
- Minecraft
- Year
- 2017
- Pieces
- 2,863
- Complexity
- Expert
- Build Time
- 8-16 hours
- Ages
- 16+
- Type
- Both play and display
About LEGO The Mountain Cave
LEGO The Mountain Cave (set #21137) is one of the larger LEGO sets, requiring dedication and space with 2,863 pieces from the Minecraft theme, released in 2017. The Minecraft line features blocky builds recreating biomes, mobs, and structures from Minecraft. At 2,863 pieces, this is a expert-level build with an estimated build time of 8-16 hours, suitable for ages 16+. As a licensed set, it recreates elements from the official Minecraft property.
Set Highlights
- 2,863 pieces across multiple numbered bags — staged building keeps the process organized.
- 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 Minecraft set — faithful recreation of the source property.
Who Is This Set For?
Gift for Minecraft Fans
The natural overlap between Minecraft 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 Minecraft 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
Open bags one numbered sequence at a time — LEGO orders them to match the build stages and keeps loose piece counts manageable.
Budget 8-16 hours across multiple sessions rather than one sitting. Fatigue leads to missed connections that are hard to trace later.
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
With 2,863 pieces, set #21137 comes with a thick instruction booklet — often split into multiple numbered bags and build stages. The official PDF is available free on LEGO.com, or use LegoFinder's AI to find it instantly from a photo.
The Mountain Cave FAQ
Related Reading
More Minecraft Sets
See all Minecraft →
Also Released in 2017
All 2017 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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