I haven't purchased any PSX (one) games in quite a while and with all the cheap used titles out there I thought I might pick up a few. I'm not looking for top 20 list, I know all of the blockbuster titles. I'm more interested in some hidden gems that may have gone unoticed perhaps because they came out early on or later when there seemed to be 50 games a month being released. What are your favourite PSX hidden gems?

UPDATE: here is the compiled list. I left out a few like Ape Escape that i thought were too well known to be considered hidden gems.

Ballistic
Battle Arena Toshinden 3
Blast Radius
Builder's Block
Carnage Heart
Colin McRae 2.0
Critical Depth
Crossroad Crisis
Crusaders of Might and Magic
DarkStone
Deception III
Devil Dice
Dino Crisis 2
Disruptor
Dracula: Last Sanctuary
Dracula: The Resurrection
Dragon Quest IV
Dragon Warrior 7
Dune 2000
Einhander
Elemental Gearbolt
Felony 11-79
G. Darius
Galerians
Gekioh: Shooting King
Ghost in the Shell
Grind Session
Guilty Gear
Heart of Darkness
Hot Shots Golf
Incredible Crisis
Intelligent Qube
Italian Job, The
Jade Cocoon
Jesse James: The Gunfighter
Jumping Flash
Jumping Flash II
Kagero: Deception 2
King of Fighters (Any Version)
Koudelka
Looney Tunes Sheep Raider
Martian Gothic
Metal Slug X
Micro Maniacs (aka Fox Kids presents Micro Maniacs)
Motor Toon Grand Prix
Nectaris
No One Can Stop Mr. Domino
Omega Boost
Pandemonium
Pepsiman
Pipe Dreams 3D
Poy Poy
Project Overkill
Puzzle Star Sweep
Quake II
Raiden Project, The
RC Copter
Red Alert (any/link)
Rogue Trip: Vacation 2012
Roll Away
Rollcage
Rollcage II
Saiyuki: Journey West
Saltwater Sportfishing
Sanvein
Sheep
Silent Bomber
Skullmonkeys
Street Sk8er
Strider 2
Strikers 1945
Super Buster Bros Collection
Super Puzzle Fighter II Turbo
Tecmo's Deception
Tempest X3
Ten Pin Alley
Thunderforce V
Tobal No. 1
Trap Gunner
Turnabout
V.I.P.
V-Rally 2
Wipeout 3 (link)
Xevious 3D/G+