// Main game loop that runs until the game is over.
private void Play()
{
EndState endState;
do
{
_map.Update();
string command = GetValidResponse(Message.ActionPrompt, new HashSet <string> {
"S", "M", "Q"
});
endState = _map.GetEndState(command);
} while (!endState.IsGameOver);
endState.Print();
}
