Kingdom Hearts 1.5 +2.5 (KH1 FM, KH2 FM, BBS FM), 2.8 (0.2 BBS), and 3.
Digimon Story Cyber Sleuth
NieR Automata
Armed Blue Gunvolt 1 and 2 (mostly 2)
Golden Sun 1 and 2
Rockman.EXE 3
FF7

And more.

This is a lot easier than the top 50. No riddles or guessing, and who's to say the games people would say are legendary would be in a top 50? The 50 greatest games of all time list would be different from the most legendary games. I mean I already listed 20 games in 4 series.

Rocket League. Came out with the perfect mechanics that haven't been changed in over 3 years. Almost 3000 hours in and I still love it as much as on the first day, maybe even more. It is its own genre as there are no games comparable to it. People love to use the phrase "Easy to learn hard to master" but this game is the embodiment of that. Perfect as a nice party game and a skill ceiling so high that pro gamers haven't even reached it after thousands of hours of training, all while being the least complex esports game that ever existed. Great to watch, great to play, simply legendary.