: This procedure involves editing a game file; create a backup copy of the file before proceeding. Use a text editor to edit the “defuser.ini” file in the game directory. Set a key binding to the following codes (for example, “F10=fly”. Then, press the corresponding key while playing the game to activate the corresponding cheat function. Note: Any active codes are disabled when a new area loads or intermission sequence plays.

Alternate endings

There are two different endings in the game, depending on how the Little Sisters were treated. If more than one Little Sister was harvested, the “bad” ending will play. If no more than one Little Sister was harvested, but the rest were rescued, the “good” ending will play.

Restoring hacked robot’s health

After hacking a robot, it will begin firing at your enemies. If the robot gets hit, it will begin to lose health, catch on fire, and eventually blow up. To stop this from happening, deactivate the robot, then reactivate it a few seconds later. This should make the robot have full health again.

Hitting the jackpot at slot machine

Save the game before you start playing the slot machine. Then, keep reloading your saved game until you hit the jackpot.

Easy money

Use the Incinerate Plasmid on any slot machine to corrupt the machine. You will usually always win money when you use the burnt out machine.

Save game recommendations

Save the game before fighting a Big Daddy or other difficult enemies. If you do not like the results (used too much health, wasted too much ammunition, etc.), you can simply reload your saved game and try again until you are satisfied.

After becoming a Big Daddy, create a new saved game. At this point, you will be close to the end of the game. If you missed something, you can go to the Bathysphere and explore Rapture again; you are also a Big Daddy now so the Splicers will not harm you, security cameras will not set off alarms, etc.

Tonic locations

Medical Pavilion

When you start, you will have the Wrench and the Electric Bolt Plasmid. Using these in rapid succession against most Splicers can often result in an efficient, quick kill. First, shock the Splicer. Before the convulsion ends, switch to the wrench, aim high, and hit the Splicer over the head. An efficient way of killing the Spider Splicers is to shoot a few clips of anti-personnel ammunition, preferably from the machine gun.

Finding Chompers’ Dental key

The key to Chompers’ Dental in the Medical Pavilion is acquired by using Telekinesis through the broken window to the left of the door. There should be a corpse hanging over the broken window. The key should be grabbed with Telekinesis because it is hanging on a wall on the other side of the window. You can get Telekinesis in an area near here. You will need to get that first, but do not follow the arrow back to the rubble that you need to get rid of until you explore Chompers’ Dental. There is a safe and other good items inside. Note: Both Telekinesis and Chompers’ Dental are near where you find the shotgun.

Reaching Atlas Fontaine’s penthouse

The code to get to Atlas Fontaine’s penthouse is “5744″, which is in an Audio Diary.

Defeating Atlas Fontaine

Atlas Fontaine, the the final Boss, has three different styles of attacks: Flame Plasmid, Ice Plasmid, and Electric Plasmid Form. An easy way to defeat him in the first part is to use your Ice Plasmid and freeze him. Then, switch to your Telekinesis Plasmid. Grab an explosive tank, and throw it at him. Also, if desired, just use your telekinesis. He is very predictable if you are far away from him. Wait for him to throw a fire ball at you, then move out of the way. He will continue to run past you. Use this chance to fire the machine gun, which does the most damage to him. Once he goes back to his chamber to gain his life back, change to the Flame Plasmid, and get ready for some bots. Once he starts his routine of fire and run, shoot him with the Flame Plasmid as many times as possible. Continue to use the machine gun while he is aflame. He will now go back to his chamber one last time. He will now have electrical powers. Keep your Flame Plasmid ready. Shoot him with the Flame Plasmid, and he will run for the water. Once he jumps in the water and comes back out, hit him with it again. Be aware that there are Splicers all over as well; set them ablaze to get some extra life. There are many different ways to defeat him, but this is an easier way.

An easy way to defeat Atlas Fontaine is to make sure that you have the fully upgraded shotgun and the Decoy ability. After you drain his Adam, drop a decoy and while Atlas is attacking it, use the shot gun. After you have used all four rounds immediately cast Decoy again, reload your shotgun, then begin shooting him again. Repeat this until you have to drain his Adam. Once again, reload your shotgun and Plasmids before you drain his Adam. Then, start over using Decoy and the shotgun. Use health packs as needed and ignore any Splicers in the area, as they will be paying attention to your Decoy just like Atlas.

Defeating Big Daddies

When fighting a Big Daddy, use armor piercing rounds from the machine gun or pistol. For a more effective way of killing, launch frag grenades and run out a door. The Big Daddy will follow you. Fire proximity mines at the door, and when it walks through it will be damaged or destroyed.

Once you have obtained the crossbow and at least five Trap Bolts, it is easy to kill a Big Daddy. Face a wall and stand about three feet away. Make sure it is not something that the bolts can bounce off of, and you have at least a ten foot long straight wall. Once you are better skilled at this technique, you can try for shorter lengths if desired. Point straight ahead and fire a bolt. Take about two steps to the left or right, depending on your location and which way the Bid Daddy is facing, and fire another. Once you fire all five bolts, shoot the Big Daddy once with anything. If done correctly, it will run through the line of traps, taking enough of his health away so he can be killed with just a few more shots. Note: This may not work in an open area because Big Daddies strafe frequently. If you have the damage increase for the crossbow, it will only take three or four bolts to kill him. Do not crouch while setting up the traps. If the Big Daddy walks another way and gets out of sight, you may need to go back to get him. If you do get him, you can crouch under the set traps. An easy way to trigger bolt traps is to pick up something with Telekinesis and drag the object through it.

Defeating Frank Fontaine

To defeat Frank Fontaine very fast, when you first enter the room, hit him with the tool the Little Sisters gave you. Fight him when he throws you off. Once he is back on the bed, run up and hit him again with the tool to drain his Adam. This works a lot faster due to him only having four or five jars of Adam to drain, and the fights are not very long afterwards.

Defeating Peach Wilkins

Once the dark cloud envelopes the icy battlefield upon which you must face Peach Wilkins, save the game, and locate the hostile turret at the end of the room when the cloud clears. Load the game, and run to it before the cloud clears, so that you can quickly freeze or shock it. Then, hack it so it shoots your enemies. Crouch down by the area to your right when facing the turret. There are a few barriers here to protect you from enemy fire. However, to avoid damage by Wilkins’ grenades, keep Telekinesis as your active Plasmid. He will avoid the turret’s fire, but as long as you stay behind the barriers by the turret he will stay at a safe distance. This gives you time to calmly return his grenades using Telekinesis until he dies. The turret will take out most of the Splicers. This method makes things much easier because it eliminates the hectic “run around and hit enemies with the wrench” strategy that is otherwise your only option. If the turret is not used as an ally, it can easily become a problem, along with the bots triggered by the security camera. By hiding near the allied turret however, you also hide from the camera’s view.

Defeating security robots

If you are up against a stationary security robot (RPG, etc.), use Telekenesis to grab a crate or pallet. Hold it in front of you until you can find a place to hide and know what to do next. The item you hold up will block some attacks.

Pac-Man reference

In the Arcadia level, you will find a place that appears to be a bar. Search around a bit, and you will see a block of cheese, followed by holes. The cheese is cut like Pac-Man himself. There are holes next to it, none of which can be gun shots. If you shoot the floor with any weapon you have, the marks will not match.

Audio Diary locations

The following is a list of all 122 Audio Diary locations: