Hi, I bought a cheap leap pad plus writing system from a charity shop with some games. however, the games which say they only work with the leap pad system work, and the ones which say leap pad plus writing don't work. This may be why it was given to a charity shop but I would like to buy some more games from ebay and don't know which ones will or won't work. Does any know what is compatible with what. i think they are no longer made now anyway so it would only be second hand games I could get. Also, can you get new pens for it as the pen works for the interactive touch the page but does not have the pencil lead bit (not essential I suppose since the writing books don't work!)