when did silksong start development

Development of Hollow Knight: Silksong officially started as a DLC expansion for the original Hollow Knight but quickly grew in scope to become a full standalone sequel. The game was officially announced on February 14, 2019. From the announcement, the development process stretched over about seven years, with the developers emphasizing a joyful and progressive creation period rather than setbacks or crunch. The game is set to release on September 4, 2025, marking over six years of development since the announcement and even longer if considering its initial concept roots from the original game's Kickstarter in 2014.