Brave Fencer Musashi (PS1, 1998)
Goemon's Great Adventure/Mystical Ninja 2 Starring Goemon (N64, 1998)

Elder Scrolls Adventures: Redguard (PC, 1998)?
Legend of Zelda: Ocarina of Time (N64, 1998/3DS)

Banjo-Kazooie (N64, 1998)?

Outliers:

MediEvil (PS1, 1998)
Sonic Adventure (DC/GC, etc., 1998)

Half-Life (PC, 1998)
​Wario Land 2/Wario Land II (GB/GBC, 1998)

Unreal (PC, 1998)
​Spyro the Dragon (PS1, 1998)

Montezuma's Return (GB/GBC, 1998) 

Tail Concerto (PS1, 1998) 

Body Harvest (N64, 1998)?

Metal Gear Solid (PS1, 1998)

Tenchu: Stealth Assassins (PS1, 1998)?

Overblood 2 (PS1, 1998) 

Trespasser (PC, 1998)?
Heretic II (PC, 1998)? 
Die by the Sword (PC, 1998) 
Quest for Glory V (PC, 1998)?
Thief: The Dark Project (PC, 1998) 
Oddworld: Abe's Exoddus (PS1/PC, 1998) 
Delta Force (PC, 1998)? 
Soukaigi (PS1, 1998)? 
Akuji the Heartless (PS1, 1998)? 
Queen: The Eye (PC, 1998)
Ganbare Goemon: Kurunara Koi! Ayashige Ikka no Kuroi Kage (PS1, 1998)? 
Jumpy's World (PC, 1998)?
Dolphin's Dream/Diver's Dream (PS1, 1998)? 
Bomberman Hero (N64, 1998)? 
Turok 2: Seeds of Evil (N64, 1998)?
Asghan: The Dragon Slayer (PC, 1998) 
Montezuma's Return (PC, 1998, 1998) 
Return to Krondor (PC, 1998)?