Can a 3x3 team challenge a referee's call?

• The officials: two referees, helped by a scorer, a scoreboard operator, a shot clock operator and, where there is one, a sports supervisor at the table.
• Advantage: the referees are told not to stop the game for incidental contact that gives the offender no advantage and puts the opponent at no disadvantage.
• Who may challenge: any player of either team.
• How: by saying "Challenge" loudly and making a C with the thumb and forefinger.
• When: at the team's next possession or the first dead ball after the incident, whichever comes first. Later than that, the request is refused.
• What: only a score or a decision that was called. A no-call that did not lead to a score cannot be challenged.
• The list: whether a made shot left the hand before the shot clock signal; whether the ball was cleared; whether possession changed before a shot; whether a goal counts and for 1 or 2 points; whether a foul on a shooter brings 1 or 2 free throws; and, in the last 2 minutes, in overtime or once a team has 19 points, out of bounds decisions.
• Lost: the call stands and the team loses the right to challenge for the rest of the game.
• Won: the call is changed and the team keeps its challenge.
• Unclear video: the call stands and the team keeps its challenge.
• Always open: whether a shot at the end of the game was released in time, and its value.

The glossary has the challenge and the shot clock.

Games are short and often settled by one basket, and several 3x3 decisions turn on a toe: on the arc or behind it, cleared or not. The challenge lets the players, who have no coach to do it, ask for the calls that video can settle. Losing the right after one failed attempt keeps it for the moments that matter.