SNAKE improvement

This PR contains a fix according to @KA101's comment in #6253: dead body of snake gives you a clue that screen is for mini-game, not for a main game.

![snapsht](https://f.cloud.github.com/assets/5421954/2240619/70fdfe86-9c9e-11e3-8052-9a248dd630dd.png)

P.S. That's silly, I know. I. just. can't. resist.