What game had areas, weapons, moves, etc that you didn’t even know existed until you already beat the game or until it was too late?
For me it was Super Metroid on SNES. Apparently there is a bunch of special or secret moves Samus can do to refill her health and such or gain unique abilities such as an ice shield.
I had probably played through the game two or three times as a kid before learning about these.
I played hundreds and hundreds of hours of TF2 both casually and competitively, practicing for hours a day, watching my replays, having higher skilled friends coach me, and eventually my team even won a ugc badge, i thought i had figured it all out and was really getting somewhere… only to realize the whole entire time I was supposed to be buying and selling hats and acting like a degenerate in trade servers