The walkthrough is very detailed, clear and complete with lots of helpful screenshots. There are maps for all the 21 hidden Sacrophagus, statues which contain red, blue and yellow (experience) spheres. The tactics against enemies are pretty good too. There's also a handy list of all achievements, trophies and challenges you can uncover. Right at the back are 12 pages of beautiful concept art illustrations, though printed on game-guide quality paper.
Here are some reasons why the book is not necessary.
Prince of Persia is not a complicated or difficult game. Whenever there's a puzzle to be solved, the in-game camera will point to the puzzle, ensuring you know where they are and where to go next. And because everything is guided, there's no need for area maps, which aren't included anyway.
While battle strategies are nice, the enemies aren't brutally tough. They have predictable fighting styles which are easy to recognise.
The only secret items in the game are probably the Sacrophagus. While it's good to have extra experience points just by breaking statues, they won't be terribly missed since they are not unique accessories that enhance attributes or anything. If you really want to collect them all, just keep an eye out for shiny dust in the air because that's what they emit.
As for the list of trophies and challenges, I'm sure you can easily find them on the Internet.
Yes, it's a very good guide, but it's just not necessary. It's there if you do need one though.
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