Please keep in mind that all states play by varying rules to begin with. Texas is one of the few that plays by NCAA rules, while many others use the NFHS rules as their basis.
Basic six-man football variations
1. Field is 40x80 yards vs. 50x100
2. 15 yards for a first down
3. All players are eligible receivers
4 . There must be a 'clean exchange' of the football. The quarterback must hand off, pitch or throw the ball before it can cross the line of scrimmage.
5 . Field goal is worth 4pts, kicked PAT is 2pts and a run/pass PAT is 1 pt.
6 . If at any point after halftime, a team leads by 45 points or more, the game is over.