Undertale: Hard Mode

Undertale: Hard Mode is DLC for Undertale, to be released in February 2016. The game is also a stand-alone title for the Wii U.

Differences in Hard Mode
You can start a new Hard Mode save file without doing a True Reset.

One of Papyrus' Trials is a mini-boss battle with a robot called "Skelebot 2000". To spare Skelebot 2000, you need to "Talk" to it five times, with it revealing it's story. The robot starts to reveal that they used to be a spaghetti servant for Papyrus, but ended up getting a upgrade from a "Dinosaur Girl" to become a human killing machine. Skelebot 2000 can throw meatballs at you, rain meatballs, brag about Papyrus, and talk about their boyfriend. In a Genocide Run, they do not maintain their normal appearance, with fierce eyes and strong armor. Their attacks are also harder to dodge.

Sans joins in at the end the fight with Papyrus, and helps out with Gaster Blasters. He claims that he is tired of Papyrus scrambling to catch you. After several rounds of Sans' attacks, he gets tired and falls over. Papyrus then drags him back home and claims that he will give Sans "spaghetti flavored hot-cocoa." This does not happen in the Genocide Run. If you kill Papyrus on a neutral run, Sans will take his place for the remaining battle. If you kill Sans, you will see their house being obstructed by a fat owl construction worker, saying the brothers were victims of a homicide and that somebody has to pay for the house. If you enter the house, you can find Papyrus' Spaghetti laying on the floor. You can take it and it heals 100 HP.

Near the end of the Papyrus Hangout/Date, Sans will come in Papyrus' room. Papyrus will start complaining saying that Sans has already interrupted something earlier. Sans tells Papyrus that kids can't fall in love with strange skeleton people, because that would be weird. Papyrus starts getting enraged at Sans' remark and tells Frisk that they'll be "just friends" until Frisk gets older.