64		Space Ace (DOS, 1989)
63		Dragon's Lair II: Time Warp (DOS, 1990)
52		Metal Gear Solid (Windows, 2000)
52		Gravity (Windows, 1995)
51		Chameleon (Windows, 2005)
51		Metal Gear Solid 2: Substance (Windows, 2003)
50		Alias Underground Episode 8: Breakout (Windows, 2003)
50		Velvet Assassin (Windows, 2009)
50		Alias Underground Episode 7: Phase One (Windows, 2003)
50		Alias Underground Episode 9: Countdown (Windows, 2003)
50		Alias Underground Episode 6: CIA Mission - Return To SD-6 (Windows, 2003)
50		Alias Underground Episode 1: SD-6 Agent Training (Windows, 2002)
50		K. Hawk: Survival Instinct (Windows, 2002)
50		Alias Underground Episode 2: Mission - Turkish Embassy (Windows, 2002)
50		Alias Underground Episode 5: Turkish Embassy - CIA Countermission (Windows, 2002)
50		Alias Underground Episode 4: The Circumference (Windows, 2002)
50		Alias Underground Episode 3: Mission - Raid On SD-6 (Windows, 2002)
45		Space Ace (DOS, 1994)
43		Dragon's Lair II: Time Warp (Windows, 1996)
42		Space Ace (Windows, 2007)
42		Tom Clancy's Splinter Cell: Blacklist (Windows, 2013)
41		Stealth Bastard Deluxe (Windows, 2012)
40		Tek-Kids Flash-Ops: Mission: Aqua Zone (Windows, 2006)
40		Alias Underground Episode 10: Endgame (Windows, 2003)
40		Tek-Kids Flash-Ops: Mission: Sky Fortress (Windows, 2006)
40		Tek-Kids Flash-Ops: Mission: Data Island (Windows, 2006)
40		Tek-Kids Flash-Ops: Mission: Polar Challenge (Windows, 2006)
40		Stealth Bastard: Tactical Espionage Arsehole (Windows, 2011)

Notes: Games similar to Guy Spy and the Crystals of Armageddon, Games like Guy Spy and the Crystals of Armageddon, ReadySoft Incorporated, ReadySoft Incorporated, DOS, Action, Full Motion Video, FMV, Arcade, Platform, Shooter, Spy, Espionage, 3rd-person, Other, PC, Game Similarities.