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Item 1 of 18

Robot Inventor

Average rating3.5out of 5 stars
Choking Hazard.
Small parts and Small Ball.

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Build, code and play with Robot Inventor!

Inspire minds with a physical-meets-digital world filled with interactive, remote-control robots and intelligent vehicles.

The latest LEGO® MINDSTORMS® evolution

5 unique designs to build, plus fun coding and challenging activities to complete with the Robot Inventor App.

LEGO® MINDSTORMS® Robot Inventor

Robot Inventor App

Includes 50+ activities that bring your creations to life.

A tough, walking guardian

Blast fires missiles, punches and hammers through obstacles.

The quirky helper

Charlie just aims to please… he also dances and plays drums.

Robot for any task

M.V.P. - a modular, multifunctional, brick-eating vehicle.

An advanced quadruped

Gelo is a fun, smart, walking robot who can avoid obstacles.

The sports fanatic

Tricky loves shooting hoops, playing ball and other sports.

A world of unlimited play possibilities

Kids will gain essential STEM skills as they play with the intelligent Hub, motors, sensors and almost 1,000 LEGO® pieces.

Enter the amazing physical and digital world of programmable, remote-control robots and intelligent creations. With LEGO® MINDSTORMS® Robot Inventor (51515), young robot fans build 5 unique, motorized robots and vehicles using the free LEGO MINDSTORMS Robot Inventor App. Then they bring them to life, one at a time, using the drag-and-drop coding environment based on Scratch and complete fun activities and challenging missions (visit for a list of compatible devices). And with almost 1,000 pieces, kids will love to come up with their own tech toy creations and share them with other robot fans on LEGO Life.

Level up the play experience
From the intelligent Hub with its 5x5 LED screen, 6-axis gyro and speaker, to powerful motors and accurate sensors, the latest evolution of LEGO MINDSTORMS coding robots for kids is the perfect way to help youngsters express and develop their creativity, while gaining essential 21st century STEM skills.

  • With LEGO® MINDSTORMS® Robot Inventor (51515), kids gain essential STEM skills as they build, code and play with remote-control robots and intelligent creations that shoot missiles, play ball, drive around and more!
  • Kids build Charlie, Tricky, Blast, M.V.P. and Gelo, and take on activities and missions using the Scratch-based LEGO® MINDSTORMS® Robot Inventor App (visit for a list of compatible devices).
  • With almost 1,000 pieces, including an intelligent Hub, 4 Medium Motors, Color Sensor and Distance Sensor with break-out interface, youngsters can also build their own fun robotic toys and share them online on LEGO® Life.
  • For fans of LEGO® BOOST and kids who love LEGO building and playing with robots, Robot Inventor is a great next step. It's also a cool gift for 10-year-olds and up, be it a birthday, Christmas or any other occasion.
  • Blast stands at over 14” (36cm) tall, while Gelo measures over 9” (24cm) long. The Powered Up components in this set are also compatible with the LEGO® BOOST Creative Toolbox (17101), Droid Commander (75253) and others.
  • An easy-to-install rechargeable battery is included with this cool toy, so no need to go hunting for spare batteries when the fun’s about to start.
  • The free LEGO® MINDSTORMS® Robot Inventor coding app for kids includes an interface based on Scratch, digital building instructions, 50+ activities, plus Python support for more advanced coders.
  • LEGO® MINDSTORMS® inspires LEGO inventors of all ages to build, code and control interactive robot toys and other creations with bricks, motors, sensors and intelligent Hubs, and share them with the MINDSTORMS community.
  • Since 1958, LEGO® building bricks have met the highest industry standards, which ensures they are consistent, compatible and connect and pull apart easily every time.
  • LEGO® bricks and pieces are rigorously tested to meet exacting safety and quality standards, so you can be sure these electronic toys won't fall apart during a mission.
  • This set features Digital Building Instructions. Now it’s easy to follow the steps on your mobile device or download a PDF of the printed building guide. Click the Building Instructions button at the bottom of this page to find and download the instructions.
Building Instructions
Robot Inventor
  • Free standard 2 to 4 business day delivery on all merchandise orders over £50!
  • Express delivery available at checkout.
  • Custom parts orders are sent separately from merchandise and take additional time to process and deliver.
  • Unopened merchandise may be returned for a full refund within 90 days of receipt of your order.
Some exclusions apply. Visit our Deliveries and Returns page for more information.

Importer to the UK from 1 January 2021:
LEGO Company Limited
33 Bath Road
Slough SL 1 3UF

Overall RatingAverage rating3.5out of 5 stars
(18 Reviews)
67% would recommend this product.


Overall Experience

Play ExperienceAverage rating4.2out of 5 stars
Level of DifficultyAverage rating3.2out of 5 stars
Value for MoneyAverage rating3.5out of 5 stars
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  • October 21st, 2020
    Average rating5out of 5 stars
    A Superb Addition to the Mindstorms Series
    | 25-34
    I would recommend this to a friend!
    Purchased for: Self
    I have been a huge fan of Lego and robotics for a number of years, so the Lego Mindstorms series is something that naturally caught my attention. My experience with Mindstorms started with the EV3 set. I originally purchased a set for personal use. I then used my role as a Primary School educator to introduce EV3 into classrooms. When I heard about the next iteration in the Mindstorms series, Robot Inventor, I couldn’t wait to get my hands on it. I had heard a few negative comments about the 51515 set before purchasing it, which raised a little bit of doubt in my mind that it would be a worthwhile purchase. Thankfully, those doubts have been firmly put to rest. The new Mindstorms set looks fabulous straight out of the box, You receive lots of little bags packed full of colourful parts, some stickers and a small booklet with some links. There are no instructions in the box, with digital instructions being favoured instead. The model instructions, as well as videos, code examples and the coding software are all contained within the new Mindstorms app. The app is well designed and easy to navigate. My one complaint so far would be the difficulty I had locating the Windows version, which was tucked away in the Microsoft App store. I would have expected the PC software to be easier to find for a new premium product such as this. A more visible link on the product page would help. The Mindstorms Robot Inventor kit features 5 new robot designs out of the box. Personally, I think these new robots are an upgrade on the models that come with the EV3 sets. Each robot model starts with a basic build. You then have the option to choose one of many additional activities to further develop and refine your robot. Charlie, which is the first robot I built, has ten additional activities to add to the base model including: a golf multiplayer game, a drum kit and a ski board. This new approach is a welcome improvement over the EV3 set. When you wish to start a new project, you can simply remove the additional parts/code and start again with your base model already built. This is in contrast with the EV3 kit, which only has one mode for each of the 5 robots. Once you get bored, you have to tear the entire thing down and start again. The biggest improvement that the 51515 Robot Inventor kit brings is in the coding software. The new Mindstorms app allows you to choose from Scratch or Python style coding, giving the user the option of block base coding or text based coding. This is such a drastic improvement over the coding software provided with the previous EV3 system. Speaking as an educator who has used the Mindstorms sets in school classrooms, this new approach to the coding is a game changer and will allow so many more children (and adults) of just about any ability to enjoy playing and learning with Lego Mindstorms. There are a few complaints from hardcore Mindstorms users which cannot go unmentioned. Robot Inventor 51515 does remove the option to daisy chain blocks. The wires are also hard wired rather than removable. Users will need to be more careful when pulling robots apart, because snapped cables will be a lot more expensive to replace now that they are built into the motors. It is a little disappointing that this new kit appears to be less flexible in its design than the previous EV3 was. Overall, I am really pleased with my purchase of the Lego Mindstorms Robot Inventor kit. The base package is a smart upgrade on the previous entries in the series with hours and hours of content to make and play with out of the box. This is before you factor in all of the fantastic creative possibilities that users will be able to design & make for themselves. The new coding software is head and shoulders above the previous EV3 software in accessibility and user-friendliness. I hope that Lego will continue to support the 51515 kit with extra features and add-ons for users to enjoy later down the line. Hopefully some of the negative aspects that current hardcore Mindstorms enthusiasts are disappointed with will be addressed throughout the product’s life.
    Play ExperienceAverage rating5out of 5 stars
    Level of DifficultyAverage rating4out of 5 stars
    Value for MoneyAverage rating5out of 5 stars
    Build Time: 3 hrs
    Building Experience: Intermediate LEGO builder
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    55Robot Inventor
  • December 15th, 2020
    Average rating5out of 5 stars
    Latest iPhone or iPad not required
    | 35-44
    I would recommend this to a friend!
    Purchased for: Self
    Using a 10 year old laptop updated to windows 10 and a Bluetooth 4.0 USB dongle, works fine with the new Mindstorms software. The programme supports either the Xbox or PlayStation 4 controller for use with the M.V.P. driving challenges, which makes it much easier to control than with a phone or tablet. To show it's versatility, have built the colour sorter from the EV3 set, see uploaded image. This new set as some great potential and I hope Lego keep supporting it.
    Play ExperienceAverage rating5out of 5 stars
    Level of DifficultyAverage rating3out of 5 stars
    Value for MoneyAverage rating4out of 5 stars
    Build Time: 3 days
    Building Experience: Intermediate LEGO builder
    Was this helpful?
    55Robot Inventor
  • October 17th, 2020
    Average rating4out of 5 stars
    I would recommend this to a friend!
    Purchased for: Self
    I got this the day it came out , and I'm having a pretty fun time with it! Here are the specs of each main piece in this set: BRICK: The Brick is a net-down to the EV3 Brick because it only has 6 ports you can connect your motors/sensors with, it does not have a screen where you can test your sensors in real time (without a phone), you can only use the rechargeable battery, no normal AA batteries, so if the rechargeable battery breaks, you need to get a new one, and the Brick is not compatible with the EV3 and EV2. The good things about it is the bluetooth connection to your phone that has the coding app is down to the nanosecond when you are looking at your sensors in real time, the sounds it makes are pretty nice, you can download up to 20 different coding projects onto it, it comes with a rechargeable battery and it is much, much lighter than the EV3 Brick. MOTORS: I'm pretty sure the motors are as fast as the EV3 ones, and they are rectangular, so you can make easier shapes when you are building them. The HUGE downside is the cord, which is long enough, but if it breaks, you cannot fix it or buy a knew cable like the EV3 cords. COLOR/DISTANCE SENSOR: The cords are the same thing as the motors, and it is kind of hard to put them on your build because there isn't much connection points on them. The distance sensor can detect anything from about 40cm away, while the color sensor can only detect something from about 14cm away, so it is a small downside when it comes to detection distance. The color sensor can detect quite a bit of colors, more than the EV3 sensor (I think). LEGO BRICKS: I am glad that there is a lot more Lego bricks than the EV3 set, and there is a wide variety of bricks. You have 6 very sturdy wheels, a big red ball and a small red ball, two white rubber bands, two huge dart launchers, a 11x19 teal technic baseplate, a bunch of gears, some cool stickers, and a lot of white technic coverings, including A LOT of the usual technic peices! Also, the charging cable is not that long, which isn't a big deal in my opinion. CODING: I love how you can use Python on the EV4, and I love even more the Snap-It coding style that is much better than the different style the EV3 used. There is a wide variety of Snap-it blocks you can use, so you can do whatever you want with your EV4 set! I would have given this set a 5-star only if the cables on the motors and sensors are basically the same ones used in the EV3 sets.
    Play ExperienceAverage rating5out of 5 stars
    Level of DifficultyAverage rating3out of 5 stars
    Value for MoneyAverage rating4out of 5 stars
    Build Time: 12 hrs
    Building Experience: Advanced LEGO builder
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    45Robot Inventor
  • December 29th, 2020
    Average rating5out of 5 stars
    I would recommend this to a friend!
    Lego has outdone themselves with this set. There are substantial upgrades over the EV3 set. - All components are smaller and lighter - more space to build, and less weight to carry. - Fast startup. - Four motors included, absolute encoders built in. - 6 axis gyroscope built into hub. - 5x5 led can scroll text, show animations, etc. viewable from a distance. Program expressions for your bot! - Rechargeable lithium ion battery included. - Scratch language is intuitive and powerful. You have advanced functions like trig if you want them, and can make custom blocks. Works great on iPad. - Python built in - no need for alternate OS. - More parts included - I prefer the wheels and find the parts more convenient to build with compared to the EV3 set. Also more gender neutral. Remote control with game controllers (PS4, XBox One) built into app. Side/downgrades - 6 ports on hub that can be used for motors or sensors. 2 less than EV3 but more versatile. - No SD slot - less opportunity for future upgrades (they got custom Linux builds on the EV3 brick). - No built in debugging or remote control on the hub. You need the app and a program (5x5 display does not allow for a menu system) Overall would recommend! My boys and I have been having a blast with this and the EV3 set.
    Play ExperienceAverage rating5out of 5 stars
    Level of DifficultyAverage rating5out of 5 stars
    Value for MoneyAverage rating4out of 5 stars
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    55Robot Inventor