Originally posted by Peanutuk
My 1986 Amiga version certainly didn't have such protection. No dongles where dangling in my box.
All my copies (US & UK releases, 2 compilation versions) need a dongle that is plugged into joystick port 2, otherwise the game freezes after the selection screen. I'm not aware of any first releases of the game without dongle protection. Perhaps your copy is a re-release or has a cracked exec?