I have "Trifold Manifesto by Erin Gumiho https://erin-gumiho.itch.io/the-trifold" in the back cover copy. And the red triangle works great!
Here's my first one! (3 more are waiting for playtest)
https://iamarat.itch.io/this-is-not-a-hotel
My second Trifold Manifesto game has been published here.
https://iamarat.itch.io/heartwood-trifold-manifesto