Also, I really don't like the way you can accidentally crash into your own
tail by reversing direction. Surround, and presumably all the other games
of this sort (like Checkmate on the Astrocade, Dominos and Tron Light
Cycles in the arcades), all prevent this.
If you look at the Surround disassembly posted some time ago, you'll find
the logic that determines which of the 3 directions are allowed based on
your current direction.
I strongly suggest you put this constraint in.
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