Which games keep you playing into the night?

Darn Pokemon! I’ve got homework to do, you know! I own more than enough entries in the Pokemon series for me and my three younger siblings to each have our own to play…at the same time. Add to that the ability to trade Pokemon almost freely, and this becomes one of the most addicting series of all time.

So we want to know: which games do you find hard to tear your eyes away from?