The thread about Tetris got me thinking, about other puzzle games.

What are your favourites?

There was a game called Soko-ban on the Commodore 64, where you had to push blocks around to make your way out of the room. I really loved that when I was younger and I still think it's a great puzzle game. Columns on the Megadrive was also fun, it had pretty music and stuff if I remember rightly.