Hello! My biggest challenge is keeping the mechanics and scale of the solo game short enough to fit on one (front and back) page! Might have to employ some small fonts on the final document :P
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The challenge in that is real, honestly a lot of it comes down to layout as I found with the one pager [front only!] TTRPGs I designed for some charity livestreams. But I've found its great for forcing you to get to the heart of how to play the game AND how to best communicate that with a potential player.