The PS1 was the king of home consoles during the mid 90's. It trumped its closest competitor - the N64 by having a strong 3rd party support and a great lineup of exclusives.

I've played a lot of amazing games during its lifetime. The most memorable of all for me is Xenogears. It had great story, a brilliant cast of characters, and a huge quest that spans 40 hours. What's the most memorable PS1 game for you?