Beyond Good & Evil takes place in the year 2435 on the mining planet of Hillys, located in a remote section of the galaxy. The architecture of the city around which the game takes place is rustic European in style. The world itself combines modern elements, such as email and credit cards, with those of science fiction and fantasy, such as spaceships and anthropomorphic animals coexisting with humans. As the game begins, Hillys is under siege by aliens called the "DomZ", who abduct beings and either drain their life force for power or implant them with spores to convert them into slaves. Prior to the opening of the game, a military dictatorship called the "Alpha Sections" has come to power on Hillys, promising to defend the populace. However, the Alpha Sections seem unable to stop the DomZ despite its public assurances. An underground resistance movement, the IRIS Network, fights the Alpha Sections, believing it to be in league with the DomZ.
Beyond Good & Evil's main protagonist, Jade (voiced by Jodi Forrest), is a young photojournalist. She resides in an island lighthouse that doubles as a home for children orphaned by DomZ attacks. Pey'j (voiced by David Gasman), a boar-like creature, is Jade's "uncle" and guardian figure. Double H, a heavily built human IRIS operative, assists Jade during missions. He wears a military-issue suit of armor at all times. Secundo, an artificial intelligence built into Jade's storage unit, the "Synthetic-Atomic-Compressor" (SAC), offers advice and "digitizes" items. The main antagonists are the DomZ High Priest, who is the chief architect of the invasion, and Alpha Sections leader General Kehck, who uses propaganda to gain the Hillyans' trust, even as he abducts citizens to sustain the DomZ.
There's also a plague ravaging the city too. The more bodies you leave behind, the worse the plague gets.
It uses the enviroments shadows as part of the stealth gameplay mechanics to hide yourself from your foes, that and you also have to be quiet around your surroundings, for example you have to walk slowly on broken glass not to make as much noise to alert you enemies.
Basically the game have a saying "If you stay in the light, you lit up like a Dutch brothel. Stay in the dark and your a ghost's shadow." Simple as that.
It's pretty good, even with Sam's iconic night vision goggles. Each new game in the series add something new to the stealth gameplay like new enemy behaviour AI, they get a bit smater with each new game if your not careful. New gadgets and upgrades, and each enviroment gets impressive to explore. Sure there's your traditional buildings to infiltrate, but later on in the games you'll be exploring jungles, being stealthy on a train, and explore a urban city.
There are some moments where you don't want to kill anybody where it would result in a mission faliure, but they do have some parts in the games where you can have a bit of action sometime, but not fully guns blazing though.
The Kalinatek building is a example where you can have a lot of fun by killing all of the goons inside, like you can setup traps for them, set them on fire, toss a gernade at them to make them panic a bit while still inside the shadow. I remember that I set off my trap early as one of my foes tries to disarm it, I shoot at my trap and set him on fire.