ÝÞ  Start position                 t  Treasure                              W  White Ghost
     ù  Passable Objects               *  Powerup Sphere                       °°  Wall     
     þ  Impassable Objects             $  Spear of Destiny                     ²²  Wall with design  
     f  Food                           ÷  Green vine                           ××  Cell
    gk  Gold key                       ¨  Secret door                          ±±  Landscape view
    sk  Silver key                    Gn  Guard - brown (level n)              ÛÛ  Elevator
     +  First aid kit                 On  Officer - white (level n)            º   Vertical Door
     a  Ammo Clip                     Sn  SS Officer - blue (level n)          ÍÍ  Horizontal Door or false elevator entrance
     A  Ammo Crate                    Dn  Dog (level n)                        ðð  Locked door (gold key)                    
     m  Machine gun                   Mn  Mutant (level n)                     ºº  Locked door (silver key)     
     c  Chain gun                      B  Boss                                 ï   Elevator Entrance