No games are precisely perfect, but sometimes games come along that couldn't possibly be any better, and are the main reasons we play video games. These games are known as masterpieces. Games that we personally feel are the height of their respective genres, and some of the very finest games known to us. Below is my full, disclosed list of games I awarded a perfect score, be it a 5, 10, 40, or a 100.
Metal Gear Solid 4: Guns of the Patriots
Uncharted 2: Among Thieves
Uncharted 3: Drake's Deception
The Last of Us
Grand Theft Auto IV
Grand Theft Auto V
Grand Theft Auto III
Go ahead and share your list of games you've awarded the highest possible score in your book.
Edit: Resident Evil 4, Shadow of the Colossus, and Pac-Man Championship Edition DX+ have all been added to the list.