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

Bit	Relating To
0	Entering the deep pool of water
1	Entering the bleak moorland
2	Entering the crystal cavern
3	Picking up the acorns
4	Placing the sword on the stone slab
5	Killing the Fomorian tribe
6	Entering the Vale of Rhia
7	N/A

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