The COMPUTER games that most come to mind are Spaceward Ho, an old school space exploration, empire builder which I still play, and 3 in 3, which is possibly the hardest game I've ever played. Some of the later puzzles just seem to be laughing at my inability to solve them. I also enjoy a good game of Minesweeper from time to time.
Console wise, there is only one game I keep coming back to, and that is Crash Team Racing. Not particularly old compared to most games listed, but still some of the best fun you can have on a console.