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The Big 3 Format

The Game

Half-court. Full pressure. Every possession counts. THE ISO CIRCUIT runs on a rulebook built for fast, physical, high-IQ basketball — closer to the blacktop than the NBA, with a scoring system that rewards range and a shot clock that never lets you rest.

3v3
Half-court format, play to 50
14s
Shot clock on every possession
2/3/4
Point values — inside arc, beyond it, and the 4-point zones
25
Points reached at halftime
SCORING
Three Designated Zones
Shots inside the arc are worth 2, beyond it 3 — and three marked 4-point zones roughly 30 feet out reward a shooter whose foot is touching the circle.
CLEARING
Rebound & Reset
After a make, the defense inbounds and gets 3 seconds to set. A defensive rebound off a shot that hit the rim must be cleared behind the arc before the attack begins — air-balls and steals don't require it.
THE "ISO" CHALLENGE
Settle It 1-on-1
Each team gets one foul challenge per half. Instead of a review booth, the call is decided on the court — a live 1-on-1 possession, winner takes the call.
FOULS
Three & Five
Three team fouls in a half sends a shooter to the line for one free throw; five fouls puts the team in the bonus, where that free throw is worth two points.
PHYSICALITY
More Contact Than the NBA
Hand-checking and heavier post play are part of the identity — and there's no defensive three-second rule, so the paint stays contested all game.
ELIGIBILITY
Open Tryouts, 18+
Minimum age is 18. Professional experience isn't required — every season starts with open tryouts and a league-wide draft pool.
SUBSTITUTIONS
Dead Ball or Timeout
Subs come during a dead ball or a timeout. Each team gets one 60-second and one 30-second timeout per game — unused time does not carry over.
REPLAY
Instant Review
Replay is used for 3- and 4-point shots, out-of-bounds calls, flagrant fouls, goaltending, basket interference, and clearance disputes.
THE BALL
The Fireball
Every game is played with the Fireball — a red, regulation men's size-7 ball built specifically for THE ISO CIRCUIT.
Think you can win the way the rulebook is written? Issue a challenge and find out.