Which type of conditional clause should I use?

Hi,

I'm describing a game, let's say, about whacking moles. You have to whack some moles to win a round. Should I write:

1. Mowing your lawn wouldn't have been fun if you hadn't whacked moles. - and you do whack moles in the game, so it's an impossible situation.

2. Mowing your lawn wouldn't be fun if you didn't whack moles. - I have no logical reason for this one> But the first one seems too complicated, and this one doesn't.

3. Mowing your lawn won't be fun if you don't whack moles. - Maybe you don't need to whack moles if you want to have fun, but many people do. On the one hand, it's a likely situation. On the other hand, it has nothing to do with the game as you don't choose whether you want to whack moles.

Hope that makes sense.
Thanks!