The Chzo Mythos is the collective title given to a series of four amateur aventure games created by Ben "Yahtzee" Croshaw using the Adventure Game Studio development tool. The games are, in order of release, 5 Days a Stranger, 7 Days a Skeptic, Trilby's Notes and 6 Days a Sacrifice. (In chronological order of the games' events: 5 Days, Trilby's Notes, 6 Days, 7 Days).