Last year I bought a DS Nintendo and a Brain training game. I got fed up with it and gave it to my granddaughter. However, I would like to play puzzle games like one I used to do free on the Yahoo games page, called Mortimer something. You had to find bits of shields and things and follow clues. Can I buy something similar and would I need to buy another DS? Any recommendations?
You may enjoy something like the professor layton games - an overall puzzle to solve with loads of mini puzzles on the way. As for whether you would need a new DS or not, depends on whether you can get your one back from your granddaughter!