There is World of Warcraft, but I wouldn't intend making that a hobby, it can be an expensive one.
Try Adventure Quest Worlds! It's prettey similar.
Some games like Free Reals and Toontown.
wizard 101
Try gaia or free realms or earth eternal.
wizard 101, luna, dungeon fighter online, and fusion fall
There are plenty of games like minecraft for free, like infiniminer and manic digger.
http://www.dailyfreegames.com/games/puzzle-games/jeopardy.html is a link to the jeopardy game. It is downloadable and completely free. If you wish to play online, then http://www.gamehouse.com/online-games/jeopardy-online has it.
There are many free building games online. If you like Lego, Brick building style games check out Roblox in the related links.
You can play most games free online. However, if you would like to download and play free games, there are several options. Flash-based games are most popular for downloading. Try websites like www.gamehouse.com/free-games, www.iplay.com/ and www.gameslist.com/.
Free car games might include playing 20 questions or the license plate game. You can find free car games for your cell phone or iPad online at places like Free Online Games or Games Freak.
Free games are available to play at places like AOL games.
There are a large variety of bow and arrow games that can be played online. One can find archery games at websites like Arrow Arcade, Free Web Arcade, and Free Online Games.
Websites afford to run free games, like chess free online, by receiving money from companies for advertisement. The companies get theirs ads on the games and the game sites afford to run the website.