PlusROM High Score Club

Choose level of difficulty: Before the game beginds, set your
Difficulty Siwtch to "A" or "B".  "A" gives you a fast game, "B"
starts a slow game, and gets faster.  Be sure to set both Difficulty
Switches in a two-player game.

Choose 1 or 2 players: Before the game begins, press down on Game
Select.  If you do not see any thieves at the bottom of the screen,
it's a 1-player game.  But if you see two thieves at the bottom,
you have selected a 2-player game.  The left joystick controls the
red thieves.  The right controls the green.

Only the first player scores will be sent (even with 2 player games).