If you're diving into the dark, non-linear world of Regret Island
Because "Regret Island" is an adult-oriented indie visual novel, official walkthroughs on major sites (like IGN or GameFAQs) are rare. Instead, the "deep guide" you are looking for usually exists in the form of regret island game guide link
Regret Island Game[v0.2.48.0] By InfiniteLust Studios - Itch.io If you're diving into the dark, non-linear world