Easter Egg Passwords
Enter any of these names for your character and you'll receive some extra, hidden dialogue. Note that most of these names won't be able to be entered as your proper name and thus will only unlock dialogue, unless otherwise noted.
Effect Password (Reloads intro sequence) Gaster "...?" Shyren [can use as own name] "............ (They're powerless to stop you.)" Napsta [can use as own name] "............ (They're powerless to stop you.)" Blooky [can use as own name] "..." Asriel "Bratty! Bratty! That's MY name!" Catty [can use as own name] "Clean name." Woshua [can use as own name] "D-don't do that." Alphys "Get your OWN name!" Undyne "hOI!" Temmie [can use as own name] "I already CHOSE that name." Flowey "I think you should chose your own name my child" Toriel "I'LL ALLOW IT!!!!" Papyru [ can use as own name] "Is this name correct? ;)" Aaron [can use as own name] "Jerry." Jerry [can use as own name] "Like, OK I guess." Bratty [can use as own name] "nope." Sans "Not very creative...?" AAAAAA [can use as own name] "OOOOH!!! ARE YOU PROMOTING MY BRAND?" MTT [can use as own name] "OOOOH!!! ARE YOU PROMOTING MY BRAND?" Metta [can use as own name] "OOOOH!!! ARE YOU PROMOTING MY BRAND?" Mett [can use as own name] "That's a little on-the-nose, isn't it...?" Murder [can use as own name] "That's a little on-the-nose, isn't it...?" Mercy [can use as own name] "The true name." Chara [can use as own name] "Uh...ok?" Alphy [can use as own name] "Wah ha ha! Why not?" Gerson [can use as own name] "You are really scraping the bottom of the barrel." Bpants [can use as own name] "You cannot." Asgore
To activate hard mode, enter "Frisk" as your starting name. You'll get a warning that this will "make your life hell"; confirm to begin playing hard mode.
The changes include not being able to flee on the first turn of battles, toughened and new enemies, and only being able to hold three pieces of candy, among other things.
In Snowdin, there is a large door that normally doesn't open for you, To open it, complete the credits without touching a single name, and beyond you'll find the developers' room.
There's a hidden enemy called So Sorry. To find him, you must read the sign at the Art Club Room in Hotland while your computer's clock is set for October 10th at 8 PM. You must also reach the MTT Resort before attempting the encounter. Lastly, So Sorry cannot be encountered on the Genocide Route, because that area of Hotland is blocked off.
Near the end of the neutral run, you'll encounter Sans. He'll judge you based on how many monsters you've killed. Finish the conversation, but don't save. Instead, reload the game from the last save and talk to him again. He'll give you a secret codeword that only a time traveler would know. Reload again for a double secret codeword, and then reload again. On this third reload, Sans will give you a key that unlocks his bedroom door in Snowdin. If you examine the dresser drawer inside his bedroom, you'll find the Silver Key. Exit the house and try walking in back of it. The Silver Key unlocks Sans's Workshop, which houses his time machine and a few story-related trinkets that change depending on your actions throughout the game.
Boost Mettaton EX's Ratings
During the final fight with Mettaton EX, if you have certain fashionable items, such as the Stained Apron or the Cloudy Eyeglasses, your ratings by default are boosted. Furthermore, certain items being used, such as the Glamburger, will boost ratings. This will make it easier to end the fight sooner.
Easily Defeat Muffet
To defeat Muffet in a single turn, you can use one of the Spider Bakery items - the Spider Donut and Spider Cider - you can buy significantly earlier in the game. Use one during the fight and it'll end immediately.
If you save the pie given to you by Toriel from the beginning of the game, and use it during the final battle versus Asgore, you will weaken his attacks noticeably; being relatively hard to dodge, this makes the battle significantly easier. Talking to him three times can also weaken him even more. You can do the 2 ways in either order.
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