Alice Is this your new video game? Ryan Yes, it is. You 'must / needn't try it. It's great! Alice How do I play? Ryan First, you have to / mustn't escape from the castle. Alice How? Down the stairs? Ryan Stop! You don't have to / mustn't open that door! Alice Oh! Too late! Am I dead? Ryan Yes. But you don't have to / must start again. Just press 'B' to continue. Alice OK, thanks. What now? Ryan You have to / needn't climb out of the window. But slowly! You don't have to / must be careful. Alice Oh no. I'm dead again. I'm not very good at this. Ryan Well, we have to / needn't play this game. I've got lots of others... Alice No, no. I mustn't/ needn't give up. Do I press 'B' again?​