Holds a single byte, where each bit relates to an item or room state as follows:

Bit	Relating To
00	Entering Lug's cavern
01	Entering the forest path
02	Picking up the rope
03	Entering the Vale of Cuchulainn
04	Picking up the urn
05	Entering the Inner courtyard
06	The ladder being placed against the platform
07	Entering the enchanted hills

Used mainly as a flag to ensure that points for game milestones aren't awarded more than once.