My DSs (11 & 9) like to have friends over during the hols (which is fine) but they all always seem to make a beeline for the Wii/ PC / video game etc.
My two then seem to take advantage of the situation and spend much more time on the Wii/ PC that I would normally let them.
If i limit it then they complain later that I'm 'mean' and that 'nobody else's Mum does that' (?)
I also actually find it hard to march into the room and get them to switch it off.
The whole 'policing' of gameing time makes me feel uncomfortable. On occasions some of their friends have been slightly rude and said "oh come on... (rolling eyes)" or just ignored me until I've had to get quite angry about.
If I tell my DCs that they can only have e.g. 45 mins then they conveniently 'forget' and then it's down to me again to stop it.
I'd prefer them to go outside/ entertain themselves in other ways. I hate all the video gaming as the 'default' activity. 
I need to have a plan before the holidays start.
What's your strategy/ policy/ tips?