Heres a few good programs that are useful for game hacking.
Cheat Engine: (Free)
http://www.cheatengine.org/
ArtMoney: (Non-Free)
http://www.artmoney.ru/
Tsearch: (Free)
http://www.timsvault.com/cheattools/tsearch.htm
IDA: (Non-Free)
http://www.datarescue.com/
Olly Debugger: (Free)
http://www.ollydbg.de/