justandyagain
1992
An all time classic. This is Sonic fully established. I've beaten it a hundred times, but recently I stop after Mystic Cave or Oil Ocean. I just don't care for the later levels and this game's version half-pipe is just a way worse special stage than any other in the series, so I don't go for Super Sonic typically
1994
2001
2006
It's Adventure 3 sans Chao. If it came out today, there would be people defending it to high heaven, and we would get a single apology tweet from SEGA. Life would go on and it would have had no major affect on the trajectory of the series. They had a great formula and it's gone because this one game was very buggy.
1993
1998
2011
2017
It's basically a perfect introduction to 2D Sonic for the mainstream of today. I would have loved to see more original zones than just the four. Titanic Monarch is one of my favorite final stages in the Sonic series, it has a truly authentic sense of challenge to the platforming. It's easy to clear while Super, but if you somehow didn't get the emeralds by this point (because the Special Rings are spammed), just take it slow and practice :)
1995
2023
2017
2021