Add yourself to the high score multiple times by pressing Esc multiple times
I can add my self to the high scores more then one time after a game finishes.
Assuming the top 10 high score is not already filled in start a game and loose all your worms by crashing into the wall.
Then when the highscore dialog comes you press esc. Press esc again to see the prompt about starting a new game Press esc again to dismiss the prompt and the high score will add you again.
Keep pressing esc and you will be added oven and over again untill top 10 is full.
Nibbles 3.36.0 Fedora Workstation 32 GNOME 3.36.2 Wayland