I haven’t gone through all of them yet, but some of the notable ones I’ve seen so far are:

  • Spoor (Lightweight free-form fantasy RPG system)
  • Tiniest D&D (3 business cards, 2 with lightweight RPG system rules and 1 with quest generator)
  • Wallet Dungeons (Build dungeons with d6’s)
  • Lost Cities (Stand-alone adventure suitable for solo play)
  • Pocket Planet Fantasy (Generate planetary systems for sci-fi adventures)
  • A Long Walk Home (Minimalist meditative solo journaling journey using thrown dice to represent a map you travel)
  • Blind Luck (Creative alternative to dice)

Let me know if you find other cool ones worth checking out! (it shouldn’t be hard)