Yes, both the Harry Potter and the Chamber of Secretsvideo game and LEGO Harry Potter Years 1-4 are available for DS.
Harry Potter and the Chamber of Secrets cannot legally be downloaded. You have to buy the game and then install it on your PC.
The paintings should be inside the Chamber of Secrets.
The Harry Potter and the Chamber of Secrets videogame was released for the Playstation, Playstation 2, Xbox, Gamecube, PC, Game Boy Advance and Game Boy Color.
The walk-through below has a list of all the secrets to be discovered during the game. http://www.gamefaqs.com/pc/562014-harry-potter-and-the-chamber-of-secrets/faqs/20211
It saves by it self
Lego creator Harry Potter and the Chamber of Secrets is a computer game whereas the rest are physical Lego sets.
2002, Harry Potter and the Chamber of Secrets
Harry Potter and the Chamber of Secrets isn't an online game. You'd have to buy the disc and install it on your computer or buy it for a gaming platform.
The ISBN is 0784533717.
Yes, there are. http://cheats.ign.com/ob2/068/482/482688.html For other gaming systems, search for "Harry Potter and the Chamber of Secrets cheats [your game system]" on a search engine.
There are free-online FAQ guides for Harry Potter: Chamber of Secrets online. They are provided by GameFAQS, a link to which can be found in related links.
The ultimate goal is to kill the Basilisk using the sword. Detailed instructions can be found here: http://www.gamefaqs.com/gamecube/561373-harry-potter-and-the-chamber-of-secrets/faqs/20966