Mario Kart, Piranha Plant Power-Up Pursuit

Building this is a relaxed, cheerful few hours rather than a marathon. The two karts come together quickly with satisfying little techniques, the Cat Cruiser in particular using curved slopes and quarter-round plates to get that smooth aerodynamic shell, and there is a neat surprise storage boot tucked in the back. The real engineering moment is the Piranha Plant's pot, where a compact gear mechanism links to the wheels through a Technic axle so the plant animates as you roll. It is the kind of small clever function that makes you slow down and admire how it all meshes together before you close it up.

This is not a set stacked with rare printed showpieces, it is more about smart use of standard elements in fun colours. The Piranha Plant head and its green stem, the pink Toadette detailing and the Koopa shell parts are the pieces most builders single out, and the shell doubles as the launching projectile via a spring-loaded function. The Technic gearing hidden in the pot is the genuine standout, an unusual thing to find in a play-focused kids set this size. At roughly nine cents a piece it is middle-of-the-road on raw part value, so you are really paying for the two vehicle designs and that one lovely working mechanism rather than a parts haul.