BradyGames' Destroy All Humans! Official Strategy Guide includes the following:   MASTER EVERY SIDE MISSION -- Increase your DNA stores by completing each side mission. Area maps indicate each mission's starting point. ALL ALIEN PROBES REVEALED -- Find every hidden alien probe in the game. Use them to unlock hidden coddies or upgrade your weapons! Area maps pinpoint their exact locations. GAME UNLOCKABLES -- Learn what it takes to open all of the game's cool movies and other extras. MISSION MAPS -- Maps of each area help guide you through each mission with ease. Whether it's the location of key objectives or vital mission info, these maps have it all! MISSION WALKTHROUGH TACTICS -- Infiltrate human society with tactics, strategies, and game-tested tips for all 22 missions! Platform: PlayStation 2 and Xbox Genre: Action/Adventure This product is available for sale worldwide.