MAC OS Panther to MAC OS 9

[Glitchologteam]

Hello there people. Ive recently bought an old Imac with Mac OS 10.3 Panther on it. I want to complety reformat the computer to instal MAC OS 9 instead (For games) and remove administrator thing (Since this computer came from an old school computer labs. Do anybody know how to do that (Or if its possible for that matter)

THANKS

EDIT: It is those Old IMac Computer which have different color for the shell