When you fire up Cheat Engine, you are standing on the edge of a precipice. On one side is your modern PC with gigabytes of RAM and 64-bit addressing. On the other side, buried deep inside that massive memory map, is a tiny, emulated 64MB sandbox where the Xbox game lives.
You begin to see the matrix of the code. You aren't playing the game anymore; you are rewriting it in real-time.
The original Xbox was a beast of a machine. While its competitors relied on proprietary, alien architectures, the Xbox was essentially a PC in a black box. You would think this would make cheating easy. After all, we are just manipulating PC memory, right?