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README.md

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+# Sudoku in Löve
+
+## Shortcuts
+
+l: go right
+k: go up
+j: go down
+h: go left
+tab: toggle editing bit / small numbers
+s: show search space
+a: insert certain numbers
+u: undo
+f: save current state to "lastBoard.txt"
+c: solve the puzzle