Ok, here it is: Monster, version 3. Made in 1979, but well preserved (doesn't look as old as he is). Easy in maintaining (not so cheap, though). Requires feeding with cabbage and meat (MEAT!) and regular jogging. Three modes implemented:
* eating
* playing
* sleeping
They say, that Monsters can also clean and do the washing up, though it's not proved (on the other hand - the are evidences of incredible ability to make great mess).