Set Details
- Set Number
- 891842
- Name
- Kai
- Theme
- Ninjago
- Year
- 2018
- Pieces
- 14
- Complexity
- Starter
- Build Time
- 10-20 minutes
- Ages
- 4+
- Type
- Play-focused
About LEGO Kai
LEGO Kai (set #891842) is a small, compact build with 14 pieces from the Ninjago theme, released in 2018. The Ninjago line features ninja-themed action sets with spinners, mechs, and dragons. This is a starter-level build suitable for ages 4+, with an estimated build time of 10-20 minutes.
Set Highlights
- 14 pieces at starter complexity — a 10-20 minutes build.
- Compatible with all standard LEGO sets — bricks extend naturally into other sets you own.
- Play-focused build with interactive elements designed for 4+ builders.
Who Is This Set For?
Gift for Ages 4+
The starter difficulty makes this accessible without being trivial — a well-matched gift for LEGO fans in the 4+ age range.
Weekend Build Project
14 pieces with an estimated 10-20 minutes fits comfortably into a focused afternoon or weekend session.
Expanding a Ninjago Collection
A solid addition for collectors building out their Ninjago shelf. Introduces parts and builds that complement other sets from the same line.
Build Tips
Check the piece count on the bag against the parts list before starting — knowing what you have prevents mid-build surprises.
Even in small sets, connection order matters. Follow the steps rather than building sections independently.
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 Kai (#891842) 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.
Kai FAQ
Related Reading
More Ninjago Sets
See all Ninjago →
Also Released in 2018
All 2018 sets →Similar Build Difficulty
Sets at roughly the same piece count and complexity tier — different theme and year, but a similar build experience.
Need Instructions for Kai?
Upload a photo of your LEGO Kai set and get the building instructions PDF in seconds.
Upload a Photo Now