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

Bit	Relating To
0	Entering Lug's cavern
1	Entering the forest path
2	Picking up the rope
3	Entering the Vale of Cuchulainn
4	Picking up the urn
5	Entering the Inner courtyard
6	The ladder being placed against the platform
7	Entering the enchanted hills

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