Any good resources for game hacking?

I am currently delving into the world of game hacking and came across this video yesterday of a really cool challenge from a previous defcon. Does anyone know of any other canned scenarios that are good to use for learning game hacking? I am not trying to outright go hack Call of Duty but these CTF style games are really fun in my opinion and help safely learn new concepts.

 

I found crackrelease.com pretty useful for picking up basic tools and figuring out how some things work. They’ve got stuff organized well enough to help you not get overwhelmed, especially if you’re just testing mods or trying things out on older games. Nothing fancy, but enough to get started without too much digging.