One-wall · Part 1 The Game
Rule 1.1 Types of games
One-wall handball may be played by two, three or four players. When played by two, it is called singles; when played by three, cutthroat (See Interpretation No.1); and when played by four, doubles.
Interpretation
“Cutthroat” is not an official tournament game. It is a game devised for use in practice with three players. There are a number of ways to play cutthroat, and the rules for singles should apply to the player playing without a partner, just as the rules for doubles should apply to two players playing as a team.