This blog post details a tool-assisted speedrun (TAS) of the NES homebrew puzzle game Tenebra. The author explains the unique mechanics of the game, including light-based movement restrictions and various puzzle elements such as torches and light sensors. The post emphasizes optimal strategies for completing each level while minimizing unnecessary actions, showcasing the ingenuity of the game's design and the author's testing for efficiency. Overall, it provides an in-depth look at the challenges of the speedrun and the decisions made during play.