Day 4
Biscuits

10x8x6

480

The biscuit shortage is over. There is much rejoicing in the forest today, and business is slower than it was yesterday as rooks stay home to eat biscuits. But not you. Oh, no. You are a busy rook who has something to prove. You are the best rook trader in the whole forest, and you will be trading heavily today - and also taking advantage of your neighbours' hospitality. And by "Hospitality," I mean "Tasty biscuits." After all, there's no reason why biscuits and commerce can't co-exist.
You are not logged in. You can continue playing without logging in, but until you do, your game data will exist only in RAM, lasting a day at most, to remind us that all states of matter and energy are temporary.

If you log in or create a new account, you can permanently save your high scores, achievements and unlock points, proceed further in the game, and hide this dumb notice.

Well, by "Permanently," I mean "I'll put it on the hard drive." Nothing is truly permanent.
ABCDE
1
4
+5-4
4
-4+4
4
+3-4
1
+5-1
1
-1+8
2
4
+7-4
1
+5-1
2
-2+3
1
+5-1
6
+3-6
3
6
+5-6
8
-8+4
7
1
+4-1
2
-2+3
4
5
-5+4
1
+6-1
8
-8+2
4
-4+4
1
+3-1
5
2
+2-2
6
+4-6
6
-6+2
6
+8-6
7
-7+1