Setting free play

System 4 to 7 games have a hidden free play setting: set adjustment 18 (maximum credits) to zero.

Systems

• Williams System 4
• Williams System 6 / 6A
• Williams System 7

Related tips

• Free play on early-1980s Williams games without a free play setting

Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part Three, Clay Harrell (pinrepair.com)