The following are known Action Replay Codes for Aliens: Thanatos Encounter on Nintendo Game Boy / Color (GB / GBC). These codes were also known as GameShark Codes and in most cases will work on both devices.

Device Compatibility: Action Replay & GameShark

Infinite Health
9163d4c0
916303d0

Infinite Time
91ff18c1

Infinite Pistol Ammo
9163ffc0

Infinite Pulse Rifle Ammo
9163c1c1

Infinite Shotgun Ammo
916300c1

Infinite Grenade Launcher Ammo
916301c1

Infinite Incinerator Ammo
916303c1

Infinite Smartgun Ammo
916304c1

Right Hand Weapon Modifier
91??52c3

Left Hand Weapon Modifier
91??50c3

Right/Left Hand Modifier List

• 00: Pistol
• 01: Pulsegun
• 02: Shotgun
• 03: Grenade Launcher
• 04: Incinerator
• 05: Smartgun
• 06: Motion Tracker
• 0c: Red Code Key
• 0d: Blue Code Key
• 0e: 20% Health
• 0f: 100% Health