I've actually had a semi-solid list for many years now, anything bellow 6-7 might be up to change eventually who knows. 1. Half-Life 2. StarCraft 3. Aliens versus Predator 2 4. System Shock 2 5. Max Payne 6. Deus Ex (2000) 7. No One Lives Forever 8. Vampire: The Masquerade - Bloodlines 9. S.T.A.L.K.E.R.: Shadow of Chernobyl 10. Serious Sam (TFE & TSE) And I add these as bonuses just because they were a huge part of my life as an early gamer but I recognise they've gained some wrinkles and extra fat. 11. Worms Armageddon 12. Starship Troopers: Terran Ascendancy 13. Armies of Exigo