Game status buffer
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8D54: Movement flags
These four bytes describe what movement can be made up, down, left and right, with the following values:
value description
0 Movement is blocked
1 Fire (fatal)
2 Ladder (can be climbed)
3 Not used
4 Empty space (can be walked through)
Used by the routines at 8B90, 8C3D, 8D0F and 8D2E.
8D54 DEFB $03, $09, $52, $45
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