In total, the kit uses 463 Lego “elements.” The rally car has one large motor, one extra large motor, and can be connected to a smartphone through the Lego Technic Control+ app.

A Bluetooth-powered smart hub brings it all together and drivers will control the rally car via the Lego Technic Control-Plus smartphone app.

Dive into the massive LEGO Technic 42131 CAT D11 (T) Bulldozer with this detailed building review that breaks down every impressive feature of this giant set. Covering the huge piece count, build ...

If money’s no object and you want a truly impressive Technic challenge, there’s the $450 Cat D-11 Bulldozer, complete with motorized functions that you can control via an app.