>>527170535
From memory hroughout my entire life:

Sonic 1
Sonic 2
Sonic 3
Sonic CD
Adventure
Adventure 2
Heroes
Unleashed
Gens
Forces
Lost world
Colours
Mania
Shadow gens
Sonic 4 episode two
Sonic runners
I also played rise of lyrics on lauch day and finished it but idk if it took 20 hours or more and i never touched it again after finishing

Not frontiers, that game was such a letdown, only have like 15 hrs and never finished