In recent years, one of the iconic game in Nintendo Wii would be Mario Kart. It was successfully because of the characters and game play of the vehicles. So it wouldn't take long for Toy manufacture like K'NEX to product these toys.
Combine with brick construction to made your own vehicle attracts fans of the game. Just look at the variety of the vehicles in various CC. LOL
How can we forget about the characters which was another iconic characters all in one package. They allow the figures to come in blind packs. It's pretty cool.
You can use the feeling of your finger tips to feel and buy these toys.
Looking at the figures already a good reason to collect the series.
Writing this post make me feel like playing Mario Kart again. Do you have that feeling too?