In the leaderboard, you can see the top players according to their difficulty level. The ranking differentiates between the "Weekly", "Monthly" and "All-Time" top players. The best is the one who solved the minefield the fastest.
By tapping the "Placement" button, your current position in the list will be displayed.
You can also get an overview of the games you have already played via the menu (three horizontal lines in the upper left corner) and the "Statistics" item. Here you can find information about won and lost games as well as best times. This display is only for you and cannot be seen by other players.