Easily the best game on the PS1, if not in all of Sony's catalog. It merged action, stealth, humor, and puzzle solving in a very new and exciting way. Voice acting in the game is impeccable and character models are quite decent considering the age of the game. Lots of unique ways to approach an enemy and very creative solutions to puzzles. There are just so many good things you can say about this game. The controls are good, music is amazing, the environments are detailed and open, the enemy AI is advanced, items and weapons are varied, etc.