A completed PDF walkthrough for Ace Combat X: Skies of Deception exists, and it is one of several guides you can use. Here is where to look and how to use a walkthrough without spoiling the whole game.
Several walkthroughs for Dungeon Siege: Throne of Agony on the PSP are available online. This guide shows where to find them and what to expect from the early game.
Syphon Filter: Logan's Shadow has 22 missions, and most players finish in about 5 to 8 hours. This walkthrough covers the order of play, the controls that trip people up, and how to get the platinum trophy.
Fan-made walkthroughs for Valkyrie Profile: Lenneth are easy to find, and some come as downloadable PDF files. This guide shows where to look and how to use a walkthrough without spoiling the story.
The walkthroughs for Prince of Persia Revelations that show up in search are written for the PSP version. Check the platform before you follow a guide.
