Open START.pptx in the Microsoft PowerPoint desktop app.
If you don't have it, you can upload the slides to powerpoint.com for a 90%-as-good experience (I think you'll have to make a microsoft account if you don't have one). If you're playing this way, once you reach the end (the floating payphone), open secret-online.pptx and enter the password.
Don't even try with Google Sheets.
Design, PPT: Qristy Overton ~ nextlevelbanana.itch.io
Art: Jake Barber ~ @bluecolossal (insta)
Music: Zachary Booth/GargleSmargle ~ https://linktr.ee/ZackBoothAudio
SFX: Adam Z
Thought Leadership: Nicole Thurmond