Above is totally a link to a pixelated version of "Plants vs. Zombies". It's endless mode only with stripped down mechanics but it gets the job done. Any video games are good video games.
I coded it up for Neville for Christmas, but figured other people might be interested. There's also a "Harry Potter" mode that can be toggled on and off. This replaces some the plants and enemies with Harry Potter themed stuff. Go get your high score on.