I'm sure many of you have played 2 games at once. I know that I like to keep my DS handy when playing games with long load times - because after all, if you aren't gaming every single second, you're clearly doing something wrong.
Taking this a step (or 14) further, Grid 16
asks you to play 16 games near-simultaneously. You spend a few seconds on one game, jump to another, then another, and eventually back to the game you started with. It's quite like WarioWare, except that you pick up where you left off when returning to a game. Try not to let your brain implode, as I hear that can tickle.