Set Details
- Set Number
- 9735
- Name
- Robotics Discovery Set
- Theme
- Mindstorms
- Year
- 1999
- Pieces
- 390
- Complexity
- Moderate
- Build Time
- 1-2 hours
- Ages
- 8+
- Type
- Educational
About LEGO Robotics Discovery Set
LEGO Robotics Discovery Set (set #9735) is a detailed build with 390 pieces from the Mindstorms theme, released in 1999. The Mindstorms line features programmable robotics kits combining bricks with sensors and motors. This is a moderate-level build suitable for ages 8+, with an estimated build time of 1-2 hours. This set dates from the 1990s, a turbulent decade when LEGO launched Star Wars and Mindstorms while navigating financial difficulties.
Set Highlights
- 390 pieces at moderate complexity — a 1-2 hours build.
- Compatible with all standard LEGO sets — bricks extend naturally into other sets you own.
- Play-focused build with interactive elements designed for 8+ builders.
- Classic-era set from 1999 — no longer in production and popular with collectors.
Who Is This Set For?
Gift for Ages 8+
The moderate difficulty makes this accessible without being trivial — a well-matched gift for LEGO fans in the 8+ age range.
Weekend Build Project
390 pieces with an estimated 1-2 hours fits comfortably into a focused afternoon or weekend session.
Expanding a Mindstorms Collection
A solid addition for collectors building out their Mindstorms 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.
Keep the instruction booklet after building — it's the most reliable reference for disassembly, cleaning, or reassembly after storage.
Finding Instructions
Building instructions for LEGO Robotics Discovery Set (#9735) 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.
Robotics Discovery Set FAQ
Related Reading
More Mindstorms Sets
See all Mindstorms →
Also Released in 1999
All 1999 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 Robotics Discovery Set?
Upload a photo of your LEGO Robotics Discovery Set set and get the building instructions PDF in seconds.
Upload a photo