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@@ -8,6 +8,7 @@ The [graphical tic-tac-toe](TicTacToeGraphical.smp) uses the Simple
[drawing library](../drawing.md). Run it with
`make run-graphical-tictactoe CTAGS=`; click a cell or press 1–9, R/Space to
replay, and Q/Escape to quit. The terminal game below remains available.
+Optional [background audio](../audio.md) supplies soft move and win/loss cues.
From `chapter31`, build the tic-tac-toe executable (without starting it):