What four games are on the PS1 Mount Rushmore?

FFVII
Metal Gear Solid
Gran Turismo 2
Crash Bandicoot 2

First two obviously defined the console and the focus on plot and characters in PS1 games. GT2 was the iconic "simulator" racer of the era, a big step up from the original, sold extremely well and established a different vibe, focusing on high end visual/audio production. Crash 2 was the big first party leap into 3D platforming, which was a bigger part of the PS1 than tends to be remembered (Crash and Spyro were both big). Racers and platformers are a lot less important today than they were then.

I was considering RE and RE2 (an exceptional game) for the 4th spot though, but RE never felt as huge as Crash during the era - it exploded among my friends with RE4. But I can see why you might want an action/horror game rep there as that genre was part of PS1's identity.