Game status buffer
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7CA1: Visible tree positions, in a grid 20 across 24 back to front.
Store 00 for no tree, 20 for a small tree, and 40 for a large tree.
7CA1 DEFS $02E0
Front row starts here. If a tree is at 7F8E-7F92, the bike has crashed into it
7F81 DEFS $20
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