Here are some hacking games to teach you how to hack:
Game 1: http://www.onlinegames.net/games/1334/hacker-1.html
Game 2: http://www.onlinegames.net/games/780/hacker-2.html
Game 3: http://www.onlinegames.net/games/1333/hacker-3.html
Enjoy hacking:D
And also break your computer in this game: http://www.onlinegames.net/games/1021/pc-breakdown.html