Well, guess Nintendo feels the same way. One of their new GBA game (can't read Japanese so can't really figure out the name) actually force players to play under the sun:
http://www.nintendo.co.jp/n08/software/u3ij/index.html
It's another vampire hunting RPG game. This little RPG game comes with a small light sensor. Which will transfer "light energy" into main character's sunbeam gun. The brighter the light, the stronger the gun will be. However, excessive light will cause the gun to "overheat" and stop working, great!
![Laughing :lol:](./images/smilies/lol.gif)
What will they think up next?
Edit: Some players confirm that the game actually detects UV light only. So it's possible to play at home without get yourself sun burn.
![Confused :?](./images/smilies/icon_confused.gif)