Legacy of Kain: Soul Reaver (PS1/PC, 1999/DC, 2000)
Shadow Man (PC/DC/N64/PS1, 1999)
Spyro 2: Ripto's Rage! (PS1, 1999/Multi, 2018 (Remake))

Tomba! 2 (PS1, 1999)
Threads of Fate (PS1, 1999)

Alundra 2 (PS1, 1999)

Rocket: Robot on Wheels (N64, 1999)

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Outcast (PC, 1999)
The Misadventures of Tron Bonne (PS1, 1999)

System Shock 2 (PC, 1999)

Romancia ~Another Legend~ (PC, 1999)?

Jet Force Gemini (N64, 1999) - WIP

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Requiem: Avenging Angel (PC, 1999)?

​Ultima IX: Ascension (PC, 1999)?
Donkey Kong 64 (N64, 1999)? - modded?

Outliers: 

Ape Escape (PS1, 1999)

Sorcerian Original (PC, 1999)?

Tomb Raider: The Last Revelation (PC/DC, 1999)?

Valkyrie Profile (PS1, 1999)?

Rayman 2 (N64/PC, 1999/PS1/DC, 2000)

Hype: The Time Quest (PC, 1999)?

Urban Chaos (PC, 1999/DC/PS1, 2000)

Indiana Jones and the Infernal Machine (PC, 1999/N64, 2000)?

Rittai Ninja Katsugeki Tenchu: Shinobi Gaisen (PS1, 1999)?

Omikron: The Nomad Soul (PC, 1999)?

King's Quest: Mask of Eternity (PC, 1999)? - 1998?

Star Wars: Episode I: The Phantom Menace (PC/PS1)?

Spriggan: Lunar Verse (PS1)?

Maken X (DC, 1999)?

Rising Zan: The Samurai Gunman (PS1, 1999)?

Soul of the Samurai (PS1, 1999)?

Xena: Warrior Princess (PS1, 1999)?

Nocturne (PC, 1999)?

​Septentrion: Out of the Blue (PS1, 1999)?

Vampire Hunter D (PS1, 1999)?

Dragon Valor (PS1, 1999)?

Lands of Lore III (PC, 1999)?

Crusaders of Might and Magic (PC, 1999)
​Silver (PC, 1999)
​Shenmue (DC, 1999) 
Drakan: Order of the Flame (PC, 1999) 
​Everquest (PC, 1999)
Hybrid Heaven (N64, 1999) 
Soul Calibur/SoulCalibur (DC, 1999)(Mission Mode)?
Spellbinder: The Nexus Conflict (PC, 1999)? 
Bomberman 64: The Second Attack! (N64)?