The strange leaflet is given to you by the Council Of Loathing. Use the leaflet and type in the cheat code "plugh" to get 100 Boost to each stat, then type in the following instructions in order:

Open Door, East, Take Sword, West, North, Cut Hedge, Pick Up Stick, West, Light Stick, East, North, Kill Serpent, Open Chest, Look Behind Chest, Look In Hole.