Undertale was once a small solo project by developer Toby Fox, but its popularity soared from its release in 2015 to what it is today. People love Undertale for its story, amazing music, and retro aesthetic that could make someone feel nostalgic for games they probably played in their childhood. It’s no surprise Toby Fox released another game, Deltarune, that’s taking off in popularity and only has room to grow.
Deltarune players have probably noticed some similarities between the two games. However, it can only be speculated on exactly what the connections between the titles mean. If you haven’t played Deltarune (or Undertale) yet, be aware the rest of this article will contain spoilers.
8 The Names Of The Games Are Similar
The first hint at Delatrune's connection to Undertale comes even before you sink into the story. Perhaps this detail will seem obvious to some, but it’s important to note the similarities between the two titles as Deltarune is an anagram of Undertale.
It could be that this is nothing more than a reference to Toby Fox developing both games. That said, when you combine the reference to the title Undertale with other hints throughout Deltarune, it adds up to a bigger meaning.
7 The Graves of the Amalgamates
Undertale introduces the moral dilemma of the fate of monsters. One scientist character, Alphys, conducts horrifying experiments on fallen monsters. She tries to put human souls in these monsters, but they become corrupted, deformed, and can not remember who they used to be.
Players can visit a graveyard in Deltarune south of town where they will find three large gravestones. Upon closer examination, you will notice they are the names of the amalgamates players can face off against in Undertale. Deltarune implies these monsters never were resurrected but instead were naturally laid to rest.
6 Rare Dialogue With Clam Girl
Undertale introduces many quirky characters, each offering something unique from comedic relief to important backstory. If the player does not choose Undertale’s genocidal route, they should talk to Clam Girl for important information.
Clam Girl will talk with the player about her neighbor’s daughter named “Suzy.” Not only is this the same name as Kris’s friend in Deltarune (just spelled differently), but it’s also important to note that “Suzy” is highlighted in yellow text as a crucial name the player should remember for later. At first, Suzy remained a mysterious figure with little backstory in Undertale: until now.
5 Undyne and Alphys
Undyne and Alphys are a favorite couple in Undertale, so it’s no surprise Toby Fox brought them back together in Deltarune. In the beginning, their relationship is vague in comparison to Undertale. By the end of Deltarune chapter two, however, the couple finally reunites with romantic implications with an adorable mission the player must go on to deliver heart candy from Undyne to Alphys.
The key thing to note from their interactions would be in whatever reality Deltarune takes place in, these beloved characters still have the same personalities and habits. Especially unusual in Deltarune is how Undyne has both eyes visible, unlike Undertale. Could this suggest that Deltarune is a prequel to Undertale?
4 Kris’s Family
Undertale and Deltarune fans alike are familiar with the dark story elements present in Toby Fox’s indie games. Undertale unraveled a broken family dynamic the more you learned about Frisk’s life. Frisk’s adoptive mother, Toriel, left her husband, king Asgore when he declared war on all of humanity, and eventually, it resulted in the death of their biological child.
While Deltarune does not dive into such a toxic family dynamic (yet), it does subtly imply a tension between Toriel and Asgore. Toriel is the same nurturing mother type who adopts a human child and loves baking them pie. Toriel’s son does not die in Deltarune, but ominously enough is not seen anywhere in the first two chapters. Asgore is still irresponsible and stubborn at times, so much so that he was fired from his last job with the town police. The incident is probably rather traumatic to Kris, considering they will not discuss it. Kris and Frisk from Undertale’s parallels are striking when you break down how their families behave similarly, just in different settings.
3 Multiple Universes
Fans of Undertale are no strangers to the multiple universe theory. In Undertale, the game gets meta and talks to the player about their other save files when starting a new game. After reading the dialogue at the home menu screen, players understand that many of the characters of the Undertale world believe in the multiple universe theory.
A multiple universe theory would easily explain the overlap of various characters or story elements both games share. Toby Fox creating a fictional world full of multiple timelines suggests all these characters can exist in the same universe.
2 Sans From Undertale
Sans is such a popular character he essentially is Undertale's mascot. He appears in Deltarune working at a local shop where the player can speak with him. He’s as sassy as ever and even hints that Papyrus is somewhere in the Deltarune universe, although we do not see him.
Sans’s role in Deltarune goes further than speaking with a familiar character. If you take notice of the warp doors in Deltarune used for fast travel, they have a very similar look to the door you will see in Sans’s bedroom in Undertale. Perhaps this means Sans can travel through the universes of both games.
1 Gaster's Theme Music
W. D. Gaster is perhaps Undertale's most mysterious and creepy character. Gaster was a scientist at CORE laboratories who worked with one of the main characters of Undertale, Alphys. Gaster is gone, but pieces of him remain hidden around Undertale. Most theories explain something terrible happened to him through his experiments.
Gaster is present in Deltarune, but his exact purpose or motivation is unclear. In the Dark World, players can try (and fail at) calling with the cell phone only to hear a weird and unsettling theme song associated with Gaster. Gaster’s music plays once again at the bunker in town.