Game: Lunar Lander (1979)

Much remembered from my childhood is the 1979 Atari Lunar Lander videogame. Many hours during summer holidays were spent/wasted attempting to land a simple vector graphic version of the NASA Lunar Excursion Module [LEM] on an equally simple vector lunar landscape (when I wasn't playing Boot Hill). I dread to think how much money in 10p pieces must've gone into various Atari stand-alone consoles (this was, of course, long before you could play these games in the comfort of your own home).
The original game is available in various places on the internet, but I quite like this slightly more flashy (though still retro) version: http://lander.dunnbypaul.net/
The true potential of videogames was revealed to me a few years later when I discovered Dragon's Lair, but that's another story...