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 "..." Asriel "Bratty! Bratty! That's MY name!" Catty [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 "Like, OK I guess" Bratty [can use as own name] "nope" Sans "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] "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.
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.
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Have We Been Fooled?
You can submit a problem report for any non-working or fake code in the lists above.