1. Marjorie Lord
2. The Secrets Of Isis
3. Faithwood Livejournal

Ever since the first person wrote out 5318008 on a calculator, nerds have been hiding secret numbers inside of your PC, and using them to negotiate secret handshakes between applications and files. Today we take a quick look at some of the more entertaining examples.

What are Magic Numbers?

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Most programming languages use a 32-bit integer type to represent certain types of data behind the scenes — internally the number is stored in RAM or used by the CPU as 32 ones and zeros, but in the source code it would be written out in either regular decimal format, or as hexadecimal format, which uses the numbers 0 through 9 and the letters A through F.

When the operating system or an application wants to determine the type of a file, it can look to the beginning of the file for a special marker that signifies the type of the file. For instance, a PDF file might start with the hex value 0x255044462D312E33, which equals “%PDF-1.3” in ASCII format, or a ZIP file starts with 0x504B, which equals “PK”, which descends from the original PKZip utility. By looking at this “signature,” a file type can be easily identified even without any other metadata.

The Linux utility “file” can be used from the terminal to determine the type of a file — in fact, it reads the magic numbers from a file called “magic.”

When an application wants to call a function, it can pass values to that function using standard types like integer, which can be expressed in the source code in hexadecimal format. This is especially true for constants, which are identifiers defined with human-readable names like AUTOSAVE_INTERVAL, but they map to actual integer (or other type) values. So instead of a programmer typing out a value like 60 every time they call the function in the source code, they could use the AUTOSAVE_INTERVAL constant for better readability. (Constants are usually easily recognized because they are written in all capital letters).

All of these examples can fall under the term Magic Numbers, because they might require a specific hexadecimal number in order for a function or file type to work properly… if the value isn’t correct it won’t work. And when a programmer wants to have a little fun, they might define these values using hexadecimal numbers that spell out something in English, otherwise known as hexspeak.

Marjorie Lord

Fun With Magic Numbers: Some Notable Examples

If you take a quick look into the Linux source code, you’ll see that the _reboot() system call on Linux requires a “magic” variable to be passed that equals the hexadecimal number 0xfee1dead. If something tried to call that function without passing in that magic value first, it would just return an error.

The GUID (globally unique identifier) for a BIOS boot partition in the GPT partitioning scheme is 21686148-6449-6E6F-744E-656564454649, which forms the ASCII string “Hah!IdontNeedEFI”, an allusion to the fact that GPT would normally be used in computers that replaced BIOS with UEFI, but it doesn’t necessarily have to be.

Microsoft famously hid 0x0B00B135 in their Hyper-V virtual-machine supporting source code submitted to Linux, then they changed the value to 0xB16B00B5, and finally they switched it to decimal before it was removed from the source code altogether.

More fun examples include:

• 0xbaaaaaad – used by iOS crash logging to indicate that a log is a stackshot of the entire system.
• 0xbad22222 – used by iOS crash logging to indicate that a VoIP app has been killed by iOS because it misbehaved.
• 0x8badf00d – (Ate Bad Food) used by iOS crash logs to indicate that an application took too long to do something and was killed by the watchdog timeout.
• 0xdeadfa11 – (Dead Fall) used by iOS crash logging when an app is force quit by a user.
• 0xDEADD00D – used by Android to indicate a VM abort.
• 0xDEAD10CC (Dead Lock) used by iOS crash logging when an application locks a resource in the background.
• 0xBAADF00D (Bad Food) used by the LocalAlloc function in Windows for debugging.
• 0xCAFED00D (Cafe dude) used by Java’s pack200 compression.
• 0xCAFEBABE (Cafe babe) used by Java as the identifier for compiled class files
• 0x0D15EA5E (Disease) used by Nintendo on the Gamecube and Wii to indicate a normal boot happened.
• 0x1BADB002 (1 bad boot) used by the multiboot specification as a magic number
• 0xDEADDEAD – used by Windows to indicate a manually initiated debug crash, otherwise known as the Blue Screen of Death.

These aren’t the only ones out there, of course, but just a short list of examples that seemed fun. Know of any more? Tell us in the comments.

Seeing Examples for Yourself

You can see more examples by opening up a hex editor and then opening up any number of file types. There are plenty of freeware hex editors available for Windows, OS X, or Linux — just make sure you are careful when installing freeware to not get infected with crapware or spyware.

As an added example, recovery images for Android phones like ClockworkMod start with “ANDROID!” if read in ASCII format.

Note: don’t go changing anything while you’re looking around. Hex editors can break things!

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IGN's Undertale cheats and secrets guide gives you the inside scoop into every cheat, hidden code, helpful glitch, exploit, and secret in Undertale.

Temmie Village[edit]

Once you've lit up all the mushrooms in the dark section in Waterfall, head on the southern path to find Temmie Village.

This is home to the temmies and also the best shop in the game as it's the only one where you can sell anything. You can purchase items from the Turtle shop in Waterfall and walk them here for a profit, or you can sell Dog residue infinitely to the Temmie. When selling items to Temmie, if she seems to really like it say no to get a higher price.

Better yet you can also buy the best armour in the game here. You'll need a decent amount of gold, and you'll have to choose to 'tem pay 4 colleg'. She'll go to 'colleg' and immediately return saying she knows how to make new Temmie Armor.

The Armor's price will vary depending on how many times you've died, so if it's too pricy, get out there and die some more.

Hacking[edit]

Undertale's code is quite easy to get into and mess around with (on PC) for simple things like If you want to give yourself extra gold.

That being said be very careful as messing with the wrong things can ruin your game files.

Take note of how much money you have in game then close Undertale.

To do so go to your start menu and choose 'RUN' now enter '%localappdata%'. Then find Undertale and open File 0 in notepad.

To make changes to your money amount go to the 11th line down (it should currently be a number that is your money in the game)change it to be however many gold you wish you had.

Hard Mode[edit]

When you start the game you're asked to pick a name, some names aren't allowed and others will make jokes but if you choose Frisk, you will unlock hard mode.

This mode only takes place in the ruins and will replace all the enemies in the ruins with those from later in the game. During the end battle with Toriel you'll be interrupted by a dog and the game will end.

Sans Room[edit]

Wonder how to get into San's room? Well here's how.

• Requirement (For best results) True Pacifist Route.

1. When you enter the golden room in New Home, save before going to chat with sans.
2. Exit the game after talking to him.
3. Repeat Step 2 about 2-3 times, and he'll give you the key.

After this, you can visit San's room back in Snowdin to get more snippets of lore.

You can also go around the back of his house to find his secret lab with more pieces of info about San's history.

Cave Room in Snowdin

SnowdinWondered what the door which is in that cave in Snowdin? Well follow the steps below to find out.

1. You will need to complete a true pacifist run.
2. Dodge all the Credits at the end of the game.

The Secrets Of Isis

Then go back to Snowdin to the mysterous door. Here is a 'developer' room with some in jokes about the games' development. If you do this before fighting Papyrus you can fight Glyde, a mysterious monster by walking around inside this room. There's no real benefit to this.

This is a monster that can only be found in the Art Club room which is in the Hotlands when heading north on a strange path.

• Set the time on your computer to be not far from 8pm on October 10. Check the clock at the MTT Resort to make sure it has the same time.
• Head back through hotland to 'Right Floor 2', past San's old hotdog stand and go north up an invisible path where the road splits.
• Not long after it hits 8pm you should run into So Sorry who you can defeat.

Faithwood Livejournal

The 'Cool Outfit' Papyrus wears has an exact replica of the Starman Emblem, also from EarthBound.

• When playing the game there is a random chance to encounter mysterious People that tell you cryptic messages about an Unkown Character named 'Gaster'
• By changing the code 'fun' to 66 you get Encounters with those 'Followers' In Hotland and Waterfall.