Lunchtime gaming

I don't know about the rest of you with young children but for me my game time has suffered since the arrival of my son 6 months ago, I blame the girlfriend personally.
I am fortunate enough however to get lunchbreaks ranging from 1 hour to 3 hours depending on how much work I have and if I can be bothered. This has proved great for me as family are out at that time so it gives me time to get some much loved gaming in.
For about a week now I have been playing Assassin's Creed 2 for about a hour each day. Normally I would not like this type of game if I put 3-4 hour blocks in as I find it repetitive. Now the 1 hour time slots have given me a new way of playing this gem of a game, even though it be in small chunks. To make things even better I am getting achievements almost every session thanks to the achievement list.
So who else has a game they play only at lunctimes due to family or other reasons?