You can't get anymore retro than this classic shoot-em-up game. Yes, the graphics are chunky - a far cry from X-Box or PS2 standards - but at the time it seemed like 'space-age' technology.
It's most likely you've come to play Tetris® through many hours of button-prodding on the Nintendo Game Boy. But the real hero is inventor Alexey Pajitnov, a Russian genius with a fixation for puzzles and an affinity with beards.
Your goal is to safely guide five frogs across the road and river so that they each in turn reach their lily pad homes. There are many obstacles along the way: if you're not too careful you could be flattened by a car, drowned in the river or eaten by a crocodile. So take it easy on the little froggies.