Undertale Anniversary

The anniversary of Undertale is an annual celebration on the SiIvaGunner channel which occurs on September 15 to celebrate the anniversary of the release of Undertale.
*Undertale 1st Anniversary: Event began as a fake-out event for rips of MOTHER / EarthBound, before actual rips of Undertale were uploaded at once.
*Undertale 5th Anniversary: Focus on rips of various unripped Undertale songs.
*Undertale 6th Anniversary: Focus on rips of various unripped Undertale sound effects. The event also included a unique banner and a community post.
*Undertale 7th Anniversary: Rips were also of various Deltarune songs and ones of Toby Fox's September 2022 status update.
*Undertale 9th Anniversary: Featured rips from the game's newsletter, Deltarune Chapter 2 Rejected Tracks.