enum CollisionFlag {
                None                            = 0x00000,
                BlockWalk                       = 0x00001,
                BlockLineOfSight        = 0x00002,
                Wall                            = 0x00004,
                BlockPlayer                     = 0x00008,
                AlternateTile           = 0x00010,
                Blank                           = 0x00020,
                Missile                         = 0x00040,
                Player                          = 0x00080,
                NPCLocation                     = 0x00100,
                Item                            = 0x00200,
                Object                          = 0x00400,
                ClosedDoor                      = 0x00800,
                NPCCollision            = 0x01000,
                FriendlyNPC                     = 0x02000,
                Unknown                         = 0x04000,
                DeadBody                        = 0x08000, // also portal
                ThickenedWall           = 0x10000,
                Avoid                           = 0x20000
        };