Once upon a time, there was the Atari 2600. And boy did it suck.
Yet we who are now older than the hills will remember it fondly, mostly because of the senility and sometimes, the brain damage. But the system had its share of good, sometimes even great, games.
Adventure was most of them. You played as a little dot (adventurer) trying to recover a chalice and bring it back to a golden castle. And along the way, a bat would steal your stuff. Or dragons would try and eat you. In turn, you could pick up an arrow and stab the dragons. But never the bat.
Anyway, someone has recreated Adventure, warts and all, on the Internet. Truly these are days of miracle and wonder...