-might well set this flag whenever they reveal the solution, whether or
-not the player guessed it correctly, on the grounds that a player
-would be unlikely to hide the solution and continue playing after the
-answer was spoiled. On the other hand, games where you can merely get
-into a dead end such as Same Game or Inertia might choose not to, on
-the grounds that the player would quite likely press Undo and carry on
-playing.)
+might well return a non-zero status whenever they reveal the solution,
+whether or not the player guessed it correctly, on the grounds that a
+player would be unlikely to hide the solution and continue playing
+after the answer was spoiled. On the other hand, games where you can
+merely get into a dead end such as Same Game or Inertia might choose
+to return 0 in that situation, on the grounds that the player would
+quite likely press Undo and carry on playing.)