Some of the puzzles are forced mates, but many of them will force you to find the best move for white and black to correctly solve the puzzle. I believe that makes these puzzles more realistic, since that’s exactly what you’re supposed to do when playing the game, finding not only your best move, but your opponents as well.
Many chess puzzle books ask the reader to solve all the puzzles from the perspective of the white pieces. But that’s also not realistic. In this book you will be asked to solve puzzles from the vantage point of the black pieces as well.