In terms of hours played
Elden ring
Pokemon emerald
Skyrim
Witcher 3
Mortal Kombat X
In terms of replay value
Tekken 8/Mortal Kombat X (fighting games have basically infinite replay value if there are people online or in person you can play with)
Dark Souls 2 (best Souls game with the best NG+ system)
Monster Hunter 4 Ultimate (best MH game, GU is a close second for me)
World of Warcraft (an addiction rather than a game)
In terms of "best game"
Elden Ring/DS2
Baldur's Gate 3
Witcher 3 (after QOL updates)
Monster Hunter 4 Ultimate
Mother 3
Honorable mentions: Chrono Trigger, Civilization V, Age of Empires IV, Fallout New Vegas, Final Fantasy VI (GBA), the other 2 Witcher games, Zelda from OOC to Twilight Princess (truly a golden age for Nintendo), Dark Souls 1, Super Metroid, Borderlands 2 (did not age well, but I have good memories of the multiplayer experience)___