(Translated by https://www.hiragana.jp/)
Rules of the game - FIBA.com
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Rules of the game

The mains rules of 3x3 are as follows:
  • 1 basket on 1 half-court

  • 2 teams of 3 players and up to 1 substitute per team

  • 12-seconds shot-clock

  • 1st team to reach 21 points or best after 10 minutes win

Read the short and long versions in English.

Go to the Rules section for the multilingual versions.