Is that the situation in Germany ? I have always played them on PC. The game's puzzles are sometimes hard but if you follow the guide, you can finish each game within a day. It's quite refreshing after you played some action filled games.
Wow ... surprising. I played one of the DS games (probably still have it here somewhere) and it was decent. But the 16 or so PC games integrated into a single case file as you added more and more. Quite cool!