[SiMoN!]

Task: Getting to Know You

In today's mystery-prize task, housemates will be tested on how well they know each other.

Before they entered the Big Brother House, housemates completed a number of psychological tests. Now they must deduce how well they did, and figure out how their fellow housemates faired too.

Together they have to rank their success rate, and win enough stuff to get a summer party.

First up, it's emotional stability - who deals best with stress and who freaks out the most. If they pass they'll win party music.

Next is intelligence - who's the brightest button in the box, and who's the dimmest bulb. Get these right and it's barbecue snacks all round.

And finally its Machiavellianism - who's the most deceptive and who's the most straight talking. If these are in the right order, they'll bag some booze.

And if they manage to pass all three - there's a mystery prize on its way.

Let's hope they're a successful bunch of rankers.