I do not own the series even though I got glory of heracles ds game, however, this book is a merger of both the fourth game that came out on super Nintendo entertainment system and the fifth game (sixth if you count the game boy game) that came out on the Nintendo ds. There's gonna be small changes that differs the fourth game (example: in glory of heracles 4, Atlantis was raided by the Greeks and it sinks because of Zeus, but in this book Atlantis wasn't raided by the Greeks but rather became allies and it doesn't sink due to Zeus and it's the location of the water taphus). I hope you understand about glory of heracles series and how it was made by the company called data east before it went bankrupted.