The thing with trackmania, people make "press forward" maps where all you need to do is to keep your finger firmly pressed on W button and do nothing else. The difficulty is in making a perfect map like this, not playing it.
I played Trackmania Turbo on PC and this game is a good example of easy to get into and hard to master.
You got 200 tracks in total divided into 5 leagues - white, green, blue, red and black, each one is more difficult than previous
The game uses a medal system for your timed runs - bronze silver and gold.
Bronze is doable easily on most tracks, requires to play without too many major mistakes / resets
Silver is a significant step up, requires to drive without any major mistake / reset but doesn't require perfect controls in air or in turns.
Gold is very difficult, you have to drive the track nearly perfectly, making use of the driving mechanics such as mid-air control and drifting. You would think that falling from height is just that... wrong! Pressing W while falling makes you fall faster. Yeah, that's Trackmania, it is not realistic
Normally it would be insanely difficult for players to unlock Black league. To unlock it you need 160 gold medals - aka you need to time Gold runs on ALL previous tracks. If that was the case, very, VERY few players would ever see Black league tracks. But there is a system that allows to bypass it. You can unlock Gold medal "joker" after succesfully timing 2 Silver runs in a row. It is not an actual gold medal, it will show a different overaly icon. But it can be used to access the league which would otherwise be very difficult to do.
That game does accesibility well.