Puzzle Generation

Do any of you have some links for algorithms on generating random puzzles?  Not sudoku or crosswords, but like stuff you would find in Chip's Challenge.

From the title, I thought this thread was the name of a generation of people. You know, like generation x or whatever. I was intrigued as to why a generation would be named that. Had some secret Russian education program been raising children to see everything in life as a game, an objective to be conquered?

Then I clicked and was disappointed.