this site has links to free games that don't require purchases, also has links to good sites for free games, and flash games!

Armor Games

http://armorgames.com/
an average game site

Kongregate

http://www.kongregate.com/
an average game site, sample a game without leaving this site by clicking here

Jay is games- link dump friday

http://jayisgames.com/tag/linkdump
updates more links every friday

Newgrounds

http://www.newgrounds.com/
a site with flash games, videos, and a bit of downloads

EyezMaze

http://eyezmaze.com/
the site that makes those grow games and stuff

Addicting Games

addictinggames.com
another flash site

Miniclip

miniclip.com
another flash site

Dan-ball

dan-ball.com
a unique site with good physics on some games

Fun orb

funorb.com
Funorb, has great graphic(not bad graphic!) games  that take awhile to load. users rate the games. It also has multiplayer on multiple games.

Candystand

candystand.com
another flash site

Andkon

andkon.com
arcade-style flash site

Tower defence

towerdefence.net
here for all of your tower defence needs!

Mochi Games

Another flash site
mochigames.com
this site has links to free games that don't require purchases, also has links to good sites for free games, and flash games!