Ok for all modern gaming systems and computers games from 1996 on, what is the hardest game set on its hardest mode and the easiest game set on its hard mode? And what game has the hardest last boss on hardest mode?

Hardest game on hardest mode for me is: Red Faction for PS2
Easiest game on hardest mode for me is: Metal Gear Solid 2 for PS2
Hardest last boss on hardest mode for me is: Phantasy Star Online for Dreamcast(offline mode)