120 minutes

World In My Pocket

An exploration and building long-form game for one civ-building enthusiast, played on an origami fortune teller (aka: a cootie catcher).
(With expansions and variant rules to play co-op, co-petitively, or competitively with any number of players (though 5 players total is a good upper limit))

Brains & Hearts

A quick-start, quick-playing, one-page zombie apocalypse RPG for three to six players. Based on LASERS & FEELINGS RPG by John Harper.