I had one of these Game & Watch when I was a kid and I played it until the buttons wore out. Takara Tomy is revisiting the old but never forgotten handheld with these Game & Watch Solar keychains. You can choose between the three models they have, Octopus, Parachute, and Chef. The solar panel is built in and powers the LCD screen which shows a short action sequence. It’s too bad you don’t actually play the game. But it is pretty neat nonetheless.
You can get these at NCSX.com for $16.90