https://www.polygon.com/2018/6/26/17505298/mario-kart-8-nintendo-switch-labo

Nintendo Labo was already a fun toy if you stuck to the software and pieces that came in the package, but Nintendo has increased the value of the Labo Variety Kit by patching Mario Kart 8 Deluxe with support for the motorcycle handlebars Toy-Con.

This means that you can turn your existing Labo construction into a portable, arcade-style controller and play Mario Kart by twisting the throttle, turning the handlebars and leaning into turns. Labo's limited racing game that was included with the package plays in a similar fashion, and full Mario Kart support for the controller is a great surprise.