This feature is an essential part of Role-Playing Games (RPGs).
It means that your character(s) can permanently gain power, even across game sessions.
In early games, this depends on password saves like Metroid or a battery backed save like Dragon Warrior.
tag : #levelup games : 22
Dragon Warrior
NES 1986@1798
Metroid
NES 1986@1271
Castlevania II: Simon's Quest
NES 1987@1690
Mega Man
NES 1987@167
Eye of the Beholder
DOS 1991@1154
Super Metroid
SNES 1994@115
Diablo
Windows 1996@636
Street Fighter 6
PlayStation 5 2023@3650