How can I play a game on my computer without installing the game on the hard drive?

Are there any computer games that can be played just by inserting the CD into the CD rom drive without installing the game to the hard drive?How can I play a game on my computer without installing the game on the hard drive?
use a moblie hard drive,
Horribly bad answer. Using a "mobile" hard drive still involves installing on a hard drive. Games will have to make registry entries on your internal drive as well.

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How can I play a game on my computer without installing the game on the hard drive?
go to www.addictinggames.com
Unfortunatly there is no game of today that ive seen that you can simply insert the disc and play. Im interested to find out though!How can I play a game on my computer without installing the game on the hard drive?
You can play plenty of games without buying them or installing anything at http://www.candystand.com
well, I hear that there's a program out there that allows you to play your flash drive as though it were a hard drive, and you can install games onto there as if it were a hard drive. Can't recollect the name.
You can get a bootable linux CD with games on it. You essentially boot the entire OS into system RAM and never touch the hard drive. Many of them will come with a decent selection of simple games. There is even a project from gentoo.org that had UT2004 Demo on it.