Sega Megadrive 16Bit : Sonic
Ps1: C&C Red Alert 1
XBox: Halo 1
Xbox 360: Halo 3
Xbox One: Battlefield 1 but i think Battlefield 5 will overtake it soon.
Pc: Hearts of Iron 2 or Medieval 2 Total war not sure i got this games 12-14 years ago and still play it from time to time