Very PlayStation console have their own set of games released exclusively for them. But some games can be played on any generation console. For example a game released for PlayStation 1 can be played on PlayStation 2 and PlayStation 3. But games released for PlayStation 3 cannot be played on PlayStation 2 and PlayStation 1. Games are released in two ways physical form such as discs and also can be downloaded from PlayStation store. PlayStation portable games can be purchased in the similar manner. Super hit games of all the PlayStation consoles are released by Sony at low prices. If a game is to join the greatest hits category it has to fulfill some conditions. For a PlayStation 1 game it has to sell minimum 250000 copies in one year. For a PlayStation 2 game it has to sell minimum 400000 copies in 9 months, for a PlayStation 3 game it has to sell 500000 copies in 10 months and for a PSP game it has to sell 250000 copies in p months to join the greatest hits category. Some of the greatest hits are god of war, gran turismo, uncharted, little big planet, motor storm. Many games are remastered to HD and are released for playstation 3.