Now days games are expensive, but some are free and enjoyable.For example, super crate box is addicting and fun along with other F2P steam games.Here are some web pages with free games and the free game makers themselves:
http://sandbox.yoyogames.com
http://www.scirra.com/arcade
http://www.addictinggames.com/
http://ninjakiwi.com/
http://store.steampowered.com/genre/Free%20to%20Play/
http://supersmashland.com/
There are many many more sites, but these are he ones I use more often.Btw, super smash land is one game, but its awesome and you can see why.