[Kevan]

When I was a kid I'd pretend my diecast dinky cars had some kind of motor (it was my hand pushing it) and pretend it was being raced on a track (it was a pile of wooden blocks laid into a circuit)...and I'd pretend I was racing one car against another
... that's 'playing'

Move forwards a few decades and all that pretend isn't pretend any more, it's real, it's not my hand pushing that car, it's not a pretend track and that imaginary car I was racing is actually hard to catch and the laps my cars are doing are measured by computer and all this captured on video, uploaded to YouTube and watched by others. 

If you want to call racing your Slot cars playing it sounds like you missed out as a kid.