Free play is in the expanded adjustments

Free play and other extra settings stay hidden until the "expand the adjustments" option is set to yes. Set it, then keep stepping through the adjustments to reach them.

Systems

• Data East CPU Version 1/2
• Data East CPU Version 3
• Data East/Sega CPU Version 3b

Games

• Adventures of Rocky and Bullwinkle and Friends
• Back to the Future
• Batman
• Checkpoint
• Guns N' Roses
• Hook
• Jurassic Park
• Laser War
• Last Action Hero
• Lethal Weapon 3
• Mary Shelley's Frankenstein
• Maverick
• Monday Night Football
• Phantom of the Opera
• Playboy 35th Anniversary
• Robocop
• Secret Service
• Star Trek
• Star Wars
• Tales from the Crypt
• Teenage Mutant Ninja Turtles
• The Simpsons
• The Who's Tommy Pinball Wizard
• Time Machine
• Torpedo Alley
• WWF Royal Rumble

Related tips

• Free play and high scores act as if memory resets every game: do a factory reset
• Flipper coil runs very hot (Time Machine and earlier)
• Game won't start a game after battery trouble: free play setting was lost

Source: Repairing DataEast 1987 (Laser War) to Sega 1995 (Batman Forever), Part One, Clay Harrell (pinrepair.com)