Undertale

Undertale is a video game developed, published, and composed by Toby Fox for PC in 2015. It is a major meme on the SiIvaGunner channel, and has held the title of being SiIvaGunner's most-ripped game since the GiIvaSunner channel (with the exception of the King for Another Day Tournament's fake game).

Overview
Undertale is a traditional RPG mixed with bullet-hell elements. It features the possibility to spare all the enemies in the game, and has different endings depending on the player's decisions. It is heavily influenced by the game ', for which Toby Fox had previously made a ROM-hack game called '.

The game tells the story of a young human who fell into an underground world to which monsters were banished a long time ago. In their quest to go back to the surface and thanks to their determination, they meet a cast of colorful characters, including (but not limited to) the goat mom Toriel, the skeleton brothers Sans and Papyrus, the killer robot show host Mettaton, and the quirky people of Temmie Village.

The soundtrack, like the game, received universal acclaim for its catchy chiptune influenced songs, and some of them even received plenty of covers and remixes on YouTube, one of the most notable examples being the track "MEGALOVANIA".

Rips
As the game's peak in popularity happened to coincide with the creation of the GiIvaSunner channel in January 2016, Undertale has been the most ripped game for almost the entirety of SiIvaGunner's lifetime, aided by the game's use of easily-identified soundfonts, such as SGM or SNES-based ones, making much of its soundtrack easy to recreate for melody changes (by 2016 standards). The game's gratuitous use of leitmotifs coupled with its popularity also lent itself naturally to the early goals of the GiIvaSunner and SiIvaGunner channels, providing a wide selection of meme melodies to insert into other games' rips.

Jokes relating to the character Sans have been the most plentiful on the channel, with "MEGALOVANIA" (Sans' battle theme) and Sans is Ness both appearing enough times to be memes in their own right. Other themes from the game such as "Bonetrousle" have also proliferated on the channel to a lesser extent, especially in 2016 rips. The game's relevance to SiIvaGunner has somewhat declined since 2016, though it has never left the position of most-ripped game despite this status earning it the strictest quality standards for incoming rips.

Additionally, Papyrus appeared as a character in the King for Another Day Tournament, bringing a handful of arrangements based on official and fan-made Undertale content to the tournament. The channel has also celebrated the game's first, fifth, and sixth anniversaries with channel events.

Deltarune
Deltarune, being a spin-off of Undertale, has naturally received quite a bit of attention on the SiIvaGunner channel. Unlike Undertale, this game hasn't had a big impact on any wider aspects of the channel, but nonetheless its leitmotifs and themes have been used as joke fodder in standard rips in much the same way as the Undertale soundtrack, only with the benefit of being more recent.