In case you've been too busy playing Halo and are not quite familiar with the "snake" genre, you start life as a tiny single dot of a snake who's goal is to move across the screen and consume other dots. The side effect of this is your body increases in size every time you grab a dot. As you grow larger and larger you will inevitably crash into yourself - which ends your game. Snake Classic takes this simple game mechanic and gives it new life with catchy music, tons of gameplay options (how many dots to grab, sound effects, etc.) In addition you get to choose what colors your snakey protagonist will have using a grid of dots that looks like something out of a kid's dream box of marbles.
You might be saying to yourself "ho hum, another snake game". However, the combination of catchy music, whimiscal graphics, and smooth motion of the snake gives this game an edge over others. The snake follows your mouse smoothly and faithfully, allowing you to do some daring corner turns and quick changes of direction. Watch out, however, if your snake friend catches up to your mouse he'll immediate whip around and bite himself. As you play Snake Classic, the levels grow in complexity as you are forced to navigate around progressively smaller and smaller doorways and obstacles, giving this game a bit of a strategic edge. You need to think a bit carefully while whipping around the screen.
All in all, a faithful rendition of the snake genre with enough variety to give you a short bit of distraction.