The Endgame
From BioShock Wiki
The Endgame, as the name would suggest, is the last level in BioShock. Jack has chased down Frank Fontaine, the final and most powerful of the bosses, and now prepares to fight him. One tip to remember, though; save the game before entering the elevator to confront Fontaine.
This is the point in the game where Jack confronts Fontaine. The game autosaves before stepping out of the elevator. After Jack defeats Fontaine, the ending differs depending on whether Jack rescued or harvested the Little Sisters.
Trap Bolts are very effective against Fontaine, as is Electric Gel. Using the grenade launcher will help a lot as well. Alternating between these and any type of ammo from the shotgun is possibly the best tactic to use against Fontaine. To the left of the entrance, there's a healing station. There's also a bot shutdown panel next to Fontaine's chair. To kill him, Jack must inflict damage upon him until he runs to recharge his ADAM and then while he is open for attack, the player must run up to him and suck out his ADAM with the Little Sister syringe, and this must be done four times.
After he is dead, Jack returns to the surface after an undetermined amount of time. After this, there are three possible endings based upon actions prior to it:
If the player harvested any or all, of the Little Sisters somewhere in during the journey, Jack will turn upon the Little Sisters who killed Fontaine, and it's assumed he killed them. After this, the cinematic shows a submarine coming upon the wreckage of the crashed plane , but it is soon surrounded by Splicers who kill everyone in it and take control of the submarine, which holds nuclear weapons. All of this is narrated by Tenenbaum's voice as she condemns Jack for his actions.
If the player harvested (killed) every single Little Sister, then the same cinematic as above, but with an angrier narration by Tenenbaum will be shown.
If the player rescued every Little Sister, then an alternative ending will be shown. The cinematic shows a bathysphere surfacing by the very lighthouse Jack entered Rapture in; this time, it is in complete daylight. The door opens, and it's filled with five rescued Little Sisters. Jack helps them out, and the cinematic proceeds to show them living happy, fulfilling events in their futures, such as graduation, marriage, and parenthood. The cinematic ends showing Jack on his deathbed surrounded by the five rescued Little Sisters that he raised. This is a heartwarming cinematic, and is narrated as such by Tenenbaum's voice.
[edit] Description
This arena is possibly the highest building in Rapture, confirmed by the overview of the city while Jack goes up the elevator. It is also supported by the window view from the main room.

