Some games like Dark Souls and Seikiro can make even the veteran gamer cry, but here is a list of games that plays better in the hard mode, that enhances the experience for the player in every way.
The "Fallout 4" Survival mode, is a whole other story with a lot of changes such as dealing with hunger, thirst, and exhaustion even fast travel is disabled.
"The Witcher 3" on Death March difficulty gives enemies approximately 80% more health and 230% more damage. Players must possess that mastery in-addition to that play flawlessly like a Witcher in order to succeed.
XCOM has a difficulty mode called the 'Iron Man' mode. It takes away the ability to have multiple saves, for example, which makes every move permanent. This heightens every choice a player makes
The Last of Us, which is a difficult game already, when switched to Grounded mode, Enemies deal more damage and are even more aggressive. Ammo, crafting, and upgrading materials aren't as plentiful. The listening mode is disabled also.
In Alien isolation's nightmare mode, the main antagonist alien becomes much smarter and relentless, so do other enemies' AI. Hence players never a catch a break throughout the game. Also, the map is unavailable in this mode.