hello! the overkill dlc is rather intuitive so you wouldn’t really need to “brute force” any endings and the like since the main gameplay is just completing moments.
the guidebook is a comprehensive guide to not just all achievements, but creator’s commentary, character bios, original edition’s guide itself, and the like - and it took me a lot of time to make, as did the overkill dlc for me to write and program. i understand wanting it to come with the dlc, though the original game is free, with over 60k+ words. i’ve already given away months of time to make something for everyone to enjoy for free. i don’t think it’s so much of an ask to be paid for my time now.
there are also full gameplays of the overkill dlc for solutions on youtube, for a purchase-free option, which you’re welcome to look into.