does the in-game timing start when "start game" is press, or when the intro ends?

I'd guess when the intro ends, looking at some longer runs on this leaderboard, but I'm not sure.

ok thanks

According to the game rules it's on start game

@DarkJohnnyBravo The in-game timer is the timer which shows in-game after the credits. That is not the timing used for this leaderboard.