Cheat Engine is a tool made to assist you with the modification of games and lets you make them harder or easier in regards to your desired results. Cheat Engine has other useful tools to help with debugging games and even regular programs as well.
Cheat Engine has a memory scanner to scan for variables used inside a game and allows you to change them, and it has a speedhack, trainer and more.
If you are new to Cheat Engine you should read the tutorial (Included with Cheat Engine, look under the programs list after installing Cheat Engine) read through step five for rudimentary knowledge about Cheat Engine.
You can DOWNLOAD CHEAT ENGINE HERE – current version is 6.1