I've got some quite unusual GAME demo's. The disks the software companies sent to the shops to be running on display.
Most are Psygnosis, most are copyprotected disks (?!) but some of the demos are very early and have different music and gfx to the final game.
I sent two to Psygore of WHDLoad (Beast 1 & Beast 2) and he's made them into WHDLoad installs.
But I've got lots more, Ork, Awesome, Gods, Barbarian etc. etc.