Set Details
- Set Number
- 70735
- Name
- Ronin R.E.X.
- Theme
- Ninjago
- Year
- 2015
- Pieces
- 547
- Complexity
- Substantial
- Build Time
- 2-4 hours
- Ages
- 10+
- Type
- Play-focused
About LEGO Ronin R.E.X.
LEGO Ronin R.E.X. (set #70735) is a large, detailed build with 547 pieces from the Ninjago theme, released in 2015. The Ninjago line features ninja-themed action sets with spinners, mechs, and dragons. At 547 pieces, this is a substantial-level build with an estimated build time of 2-4 hours, suitable for ages 10+.
Set Highlights
- 547 pieces at substantial complexity — a 2-4 hours build.
- Compatible with all standard LEGO sets — bricks extend naturally into other sets you own.
- Play-focused build with interactive elements designed for 10+ builders.
Who Is This Set For?
Gift for Ages 10+
The substantial difficulty makes this accessible without being trivial — a well-matched gift for LEGO fans in the 10+ age range.
Weekend Build Project
547 pieces with an estimated 2-4 hours 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
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 Ronin R.E.X. (#70735) 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.
Ronin R.E.X. FAQ
Related Reading
More Ninjago Sets
See all Ninjago →
Also Released in 2015
All 2015 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 Ronin R.E.X.?
Upload a photo of your LEGO Ronin R.E.X. set and get the building instructions PDF in seconds.
Upload a photo