I've loved these games since I was a kid, and they're still challenging enough as a young adult. Danger by Design is one of my favorite Nancy Drew games. The puzzles in this one aren't the most difficult of the ND series (which is good, as some are literally impossible in the advanced mode of some of the other games unless you make a series of miraculous accidents) and definitely aren't a breeze at any point, besides the paintings you must reproduce to raise money. I recommend this game, and Senior mode is doable.