Z-Phone

The Z-Phone is a feature in Make a Good Mega Man Level: Episode Zero. A communications device invented by Dr. Wily, he gives it to Zero after the latter arrives at his newest hideout. While in a level, the Z-Phone can be accessed from the pause menu (or from a dedicated option on the world map), with the option to call a number by typing in a four digit number.

There are seven primary contacts, all unlocked throughout the game under various means, and their numbers are saved in an easily-accessible contact list. Each one has a specific function, and can be called on to receive certain information:

• Dr. Wily - Unlocked by default. When called, he gives background lore on the current level, such as what it is and why it was built. After Zero abandons Wily in Chapter 2, this number will stop working until Null and Void is cleared.
• Dr. Hyde - Unlocked at the start of Chapter 2. When called, she explains the abilities of the player's current weapon and/or chip. Sometimes, she will also give advice on how to use the weapon wheel, or will give some background information about her activities.
• Agent Krantz - Unlocked at the end of Chapter 1. When called, she gives advice on what enemies and/or gimmicks are in the current stage, and how best to deal with them. In some levels, Agent Stern answers instead, but he still gives the same advice.
• Galaxy Man - Unlocked after clearing Construction of Constructions. When called, he points Zero towards the location of uncollected CDs in the current stage, and provides tips on how to collect them.
• Yamato Man - Unlocked after clearing Mojo Dojo. When called during a boss fight, he will warn of certain attacks, give strategies on how to defeat them, and occasionally hint at their weakness. If called outside of a boss (or when facing a devkit miniboss, excepting Stompy or Lavaproof Response Cannon), he will be noticeably less helpful. Notably, when Yamato Man is called during his own boss fight, Tomahawk Man will answer and fulfill the number's purpose instead.
• Pirate Man - Unlocked by talking to him at Chateau Chevaleresque. A joke contact, when called he will often give useless "Pirate Tips", tell nonsensical stories, or try to posit some inane conspiracy theory. A select few of his calls, however, provide actually useful information, such as the existence of ladder jumping, the effectiveness of the Z-Saber against shielded enemies, and stomp dashing providing a greater speed boost than normal dashing, among other tips.
• Knives - Unlocked by finding out her number and calling her in the postgame. When called, she will judge the current level's suitability as a date spot for her and Zero, invariably finding a reason to reject it. Notably, she can only be called in a specific area hidden in the level (usually, but not always, 32 x 32 pixels in size), and her calls cannot be repeated once found.

With the exception of Knives, all these numbers will not work if Zero doesn't already have them registered in the Z-Phone. In addition to these contacts, there are several secret numbers that can be contacted, though some will only work in certain levels.

List of valid Z-Phone numbers

All of these numbers are accessed by dialing them on the Z-Phone's keypad. Though represented as four-digit numbers, numbers with three or less digits don't need 0s at the front to work.

Number	Info
0000	Zero calls the phone operator, who instructs a confused Zero to dial the person he wishes to speak to before hanging up.
0052	Calls Non-Human from Action 52.
0064	Summons the Wario Apparition. If done in Defeat the Giant Spear Man!, calls Wario instead.
0112	Responds with the next few numbers of the Fibonacci sequence.
0120	Responds with "The safe has been unlocked".
0135	Plays the Unown Radio theme from Pokémon Gold and Silver.
0205	Plays an unknown sound effect, possibly from a Gameboy game.
0230	Calls Youngster Joey from the Pokémon series.
0306	A call featuring Dante from the Devil May Cry series, probably with a metaphorical sticker saying that attached to it too.
0329	Plays the number 1 song in Bikini Bottom, "Electric Zoo".
0411	Agent Krantz's number. Will not work until obtained at the end of Chapter 1.
0415	A call involving a snippet of dialogue from Half-Life VR AI.
0420	If called when the system time is at 4:20AM/PM, a message celebrating the occasion appears. At any other time, the number does nothing.
0430	Re-enacts the "turn the game console off" codec call from Metal Gear Solid 2: Sons of Liberty, with Colonel Roy Campbell and Agent Krantz (who stands in for Rose) talking to Zero (who stands in for Raiden). The Colonel's mugshot gradually changes from his Metal Gear 2: Solid Snake mugshot, to his mugshot from the original release of Metal Gear 2, to Colonel from Mega Man X4, and finally what appears to be a real-life figure.
0550	Galaxy Man's number. Will not work until after clearing Construction of Constructions.
0606	Displays "You played the Sonata of Awakening!". The sounds while inputting the number resemble the Sonata of Awakening from The Legend of Zelda: Majora's Mask.
0623	Knives's number. Will not work until obtained after clearing Null and Void.
0630	Displays "You played Epona's Song?". The sounds while inputting the number resemble Epona's Song from The Legend of Zelda: Ocarina of Time.
0717	Calls Axl, before killing Zero. Similar to 8008.
0801	Same call as 0430.
0816	Only works during the battle against Big Chungus. When called, the music will be changed to an 8-bit remix of Big Chungus' "official main theme" by YouTube user Endigo, and Big Chungus itself will dramatically grow in size. Despite the size increase, the HP and damage output of the boss are unaltered, and the size of his projectiles remain the same as well. If the call is activated when Big Chungus is close to a wall, he will clip into the wall, and will keep trying to jump out until he finally goes offscreen. At this point, the player is softlocked, as no attack in Zero's arsenal can reach him.
0909	Displays the famous "Squidward's House" copypasta from a certain review of the SpongeBob SquarePants episode "Good Neighbors".
0928	Calls Proto Man, who whistles into the phone, angering Zero.
0950	Displays "You played the Song of Healing?". The sounds while inputting the number resemble the Song of Healing from The Legend of Zelda: Majora's Mask.
1012	Responds with "You're not the one". References the ghost girl event from Pokémon X and Y.
1029	Same call as 0120.
1101	Calls the famous and popular Mega Man X6 character, Gate.
1102	Yamato Man's number. Will not work until obtained after clearing Mojo Dojo.
1138	Calls the Meteor Police from the 1987 graphic adventure game Maniac Mansion.
1181	Sophie Hyde's number. Will not work until obtained at the start of Chapter 2.
1230	Same as calls 0120 and 1029.
1287	Dr. Wily's number. If called after Dr. Wily's Secret Bunker is abandoned, the call will only play static. It returns to normal after beating the game.
1337	Displays Zero Wing's intro dialogue, but written in leetspeak. CATS makes a cameo appearance when saying his original lines.
1977	Same call as 1138.
1987	Only works in Volt Man Factory. When called, a gold-coloured Volt Man yells randomly-generated gibberish before the game automatically closes itself. This call references a similar event in Five Nights at Freddy's, where setting the animatronics' AI to 1-9-8-7 causes a Golden Freddy jumpscare, followed by the game closing itself.
2001	Calls Professor E. Gadd, who tells Zero about a ghost that had escaped his portrait gallery by the name of Chesder, and that said ghost can most likely be found in a level with many skulls. An extra bit of dialogue will be added to the call if the player has already completed Ghouls n' Ghasts, in which E. Gadd will compliment Zero for having taken care of Chesder. The call itself is taken almost verbatim from Luigi's Mansion; specifically, it comes from the conversation between Luigi and E. Gadd in the Telephone Room after the blackout in Area 4, in which the latter warns the former of the reclusive Uncle Grimmly. Chesder replaces Uncle Grimmly as the main subject of the call, and various other dialogue is modified to fit into Episode Zero as a whole.
2008	Calls Plug Man, who disappointedly tells Zero that he has nothing special to share with him, and to call back later.
2401	Creates a unique, friendly variant of the Trailing Zero from Null and Void, complete with Mega Man's color scheme. The clone will only disappear when Zero dies or exits a level, and is intangible to all enemies and hazards, much like the harmful Trailing Zeroes. It will copy all of Zero's movements one-for-one, but the only weapon of his that the clone can copy is the Z-Saber, which will damage enemies and objects like the real Zero's, enhancing the latter's DPS when using said weapon alongside the clone. Notably, with the exception of the Cutter Saber's rolling slash, the clone cannot replicate any of the chip-specific saber attacks, and its saber will always be green regardless of the chip equipped. Also notable is that only one clone can exist at a time, and the call will have no effect if the 5000 number is already in effect.
2525	Flips Zero's gravity, no matter where he is. The number references how the numbers 2 and 5 resemble vertically-flipped versions of each other.
2580	Calls Albert Wesker (misspelled as "Whesker" in-game), one of the major antagonists of the Resident Evil series, who shouts "YOU WILL GIVE ME AN EGG!" before hanging up. Said line comes from Resident Evil 5, where Wesker is playable in certain game modes, and can demand items from other players, including rotten eggs. The line was popularized when it became the Twitch sub notification sound clip for YouTube user and streamer Proton Jon.
2602	Displays "You played the Song of Storms!". The sounds while inputting the number resemble the Song of Storms from The Legend of Zelda: Ocarina of Time.
3000	Same call as 2001.
3122	Calls (presumably) Scorpion from the Mortal Kombat series, who exclaims his iconic line "Get over here!" before hanging up. After the call is completed, all enemies and/or objects that get sliced in half by the Z-Saber will produce a red particle effect that simulates blood, something that the Mortal Kombat series is infamous for having plenty of. The effect will go away when Zero dies or exits a level.
4665	Pirate Man's number. Will not work until obtained by talking to him in Chateau Chevaleresque in Mega City.
5000	Summons the Trailing Zeroes from Null and Void. Up to twenty copies can be created, and they work the same as in their source level. The only way to stop them from spawning is to die, as they follow the player everywhere, even through screen transitions. This call will have no effect if the 2401 number is active.
5522	An unknown entity answers the call and repeats everything that Zero says, much to the latter's annoyance.
5905	Displays "You played Saria's Song?". The sounds while inputting the number resemble Saria's Song from The Legend of Zelda: Ocarina of Time.
6096	Displays "You played Zelda's Lullaby!". The sounds while inputting the number resemble Zelda's Lullaby from The Legend of Zelda: Ocarina of Time.
6666	Sets Zero's HP to 1.
6969	The phone sarcastically congratulates you for calling the funny number.
8008	The Z-Phone sarcastically mocks you for your puerile sense of humor, and instantly kills Zero as punishment.
9111	Same as calls 1138 and 1977.
9259	Displays "You played the Song of Time!". The sounds while inputting the number resemble the Song of Time from The Legend of Zelda: Ocarina of Time.
9999	A mysterious entity congratulates Zero for calling the final number in the index, much to his bewilderment.

Trivia

• The numbers for the primary contacts each have specific meaning to them:
  • Dr. Wily's number, 1287, references December 1987, the release date of the original Mega Man.
  • Hyde's number, 1181, is a combination of the atomic numbers for sodium (11), oxygen (8), and hydrogen (1), which make up sodium hydroxide.
  • Krantz's number, 0411, references April 2011, when the first issue of the Mega Man Archie Comics series was released.
  • Galaxy Man's number, 0550, is the escape velocity of the Milky Way from the position of the Sun (550km/s).
  • Yamato Man's number, 1102, references Japan's National Foundation Day, which is celebrated on February 11.
  • Pirate Man's number, 4665, is how "hook" would be spelled when typed on an old flip phone's number pad.
  • Knives' number, 0623, is June 23, the Japanese release date of Pokémon Black 2 and White 2 - the source of inspiration for her sidequest.

• In a secret room near the start of String Theory, there is a particular tile where the Z-Phone will ring during normal gameplay. If the menu is opened while this is happening, a unique call will play out.
  • It has been confirmed that this behaviour was coded in as a scrapped method for progressing through the Knives quest, and was most likely placed here to avoid leaving it unused.