The Wii version is a faithful port of the original PC game. The graphics are not as good, but everything else works pretty much the same. The only real difference is the price, which is around $10 more for the Wii version than the PC version.
The Hardy Boys: The Hidden Theft tries hard to recreate the golden days of point-and-click adventure gaming. While its intentions are good, the exploration and puzzle-solving suffer from poor planning and execution.