I was able to do a playtest of my card game Maximum Shift (title pending) during lunch today. The game is for 1 to 4 players. I was trying to keep the rules as simple as possible, gearing the gameplay to the 7+ age range.
Good news: it doesn't suck.
In its current iteration, it's actually quite good. It's a good, quick, card game that doesn't take a lot of room. The only issue I can see right now is having a way where each player can keep track of their times (score). I suppose a piece of paper and a pencil will do for now.