FreeGameDev

wrong description

A4 is not R2

the same with C5 and X6

No, that just shows the last commit that changed it.

but why stands next to "A4-Snake" something with R2???

Well I never use that view of repo.
Generally I prefer this view:
https://github.com/stuntrally/tracks/commits/master
it shows exactly what happened lately with tracks.
(and this is for main SR repo (code+data) https://github.com/stuntrally/stuntrally/commits/master)

It's a repo, a commit can span across tracks (directories), eg. I sometimes include some minor change to other track while pushing another track, or just do something that improves few tracks at once, etc.
Anyway if you click on the commit you'll see exactly what changed
https://github.com/stuntrally/tracks/co ... 7ce493e281
and in A4 just road texture tiling (tcMul) was decreased (nothing special to make a whole commit about).