It depends on how much time that you want to kill. If you want to kill short blocks of time like 15-30 minutes at a time, Tetris (which is literally the best selling game ever) is a good place to start. It can be found on just about any operating system, from any of the big home consoles to graphic calculators to cell phones. Other games to kill in larger chunks (couple of hours) would be "retro" games: games like Pac-Man, Space Invaders, Pitfall, River Raid, etc. As far as killing extreme amounts of time (several hours/days), it depends on what type of games that you like. Role playing games include just about any of the Final Fantasy games (which the exception of FF 13, which is generally thought of as crap). First person shooters include Gears of War and Call of Duty 4. General overall games: Grand Theft Auto 4 or just about any of the Resident Evil games comes immediately to mind. Hope this helps.