Walls of N'zzar

From publisher blurb: Some walls’ purposes are to separate, others to protect. Behind the walls of N'zzar there is much more than you can imagine, and only a group of new inhabitants will be able to find out the truth that lies behind them. Walls of N'zzar is a one shot adventure written entirely in one page. It can be played with any generic RPG system and you are going to need a player to be the Storyteller (Game Master a.k.a GM) and 4 players to take the roles of the Playable Characters (PC).