Remember the days before the Nintendo Gameboy? Where, if you wanted to play your favorite games you needed to buy specialized handheld scaled-down versions. With their smaller screen size and memory these games were definitely simpler, but that did not always make them less addictive, especially on a long car ride.
Now if you want to try out these classics, you can cruise the garage sales searching for your favorite and see if you can get them working or you can drop by “Handheld Remakes” Online gaming section. Just click on your fave and play till you heart’s content. As a bonus? No Batteries required. (But you may need Shockwave Flash, Director or Java)