Cheat: Overnight Max Stealth
No, it's not a code; just one of the very few exploits that snuck its way into our list. There are a lot of character attributes to develop in Skyrim. One that you don't have to worry about is stealth, which you can upgrade to its maximum level while you sleep. You're credited with Stealth every time you're crouched near an enemy while staying unseen.
This exploit works because Skyrim's developers did not add stop animation for the times that a character walks at an obstacle. To max out stealth with minimal effort (as well as gain extra levels) crouch behind a wall or rock near an enemy. Then move forward against the obstacle, and stick a piece of tape on your controller keeping your characters in perpetual forward motion. Keep your console on for about a day and you'll have full stealth when you return.