LEGO has revealed a new interactive system called LEGO SMART Play, which adds built-in electronics to physical LEGO sets to make them react with sounds, lights, and movement. The system was shown this week at CES 2026 and represents one of LEGO’s biggest changes to traditional play in decades.

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The Smart Brick looks very similar to a normal 2x4 Lego brick, but it contains a custom Application Specific Integrated Circuit (ASIC) chip which is smaller than one of the studs on the brick itself. It’s joined by an accelerometer and a copper coil, and Lego has created its own Play Engine and Neighbor Position Measurement (NPM) system.

K-2SO comes in eight well-organized bags; no less than three years ago, LEGO was still inconsistent when it came to bagging its pieces. Bag #1 might come in a single bag labeled '1,' whereas Bag #2 might be spread out across two bags, both labeled '2.