Following will be the tools I will be using during my Game Hacking Endeavours.Choice of tools depends on your personal preference, cash in hand, Experience , liking and many other factors.
IDA Pro : A great disassembler with many powerful features, multi platform , fast and easy to use 😉
IDA is the Interactive DisAssembler: the world’s smartest and most feature-full disassembler, which many software security specialists are familiar with. Written entirely in C++, IDA runs on the three major operating systems: Microsoft Windows, Mac OS X, and Linux.
IDA is also the solid foundation on which our second product, the Hex-Rays decompiler, is built.
The unique Hex-Rays decompiler delivers on the promise of high level representation of binary executables. It can handle real world code. It is real.
Buy IDA : https://www.hex-rays.com/index.shtml
OllyDebug : Olly debug is a debugger and one of the most powerful out there. It can be obtained for free from here http://www.ollydbg.de/ you can get a fully function Olly with all necessary plugins from here http://www.thelegendofrandom.com/files/tools/R4ndoms_OllyDBG.zip
last but not the least
WireShark : Wireshark is best network sniffing and packet capture tool available out there. which can be obtained from here http://www.wireshark.org/