It depends on which PlayStation it is (1, 2, 3 or the portable one) plus the cost of each game.
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No you cant. sony playstation 2 games are very much so diffrent then sony playstation 1 games but out of all buddy my reccomendation would be the sony playstation 3
You can not play PlayStation 3 games on a PlayStation 1, but you can play PlayStation 1 games on a PlayStation 3. All of the PlayStation consoles are backwards compatible.
The PlayStation 3 weighs in at approximately five kilograms (5 Kg).
You cannot play Playstation 4 games on a Playstation 4 console. You are also unable to play Playstation 3 games on the Playstation 4.
Gran Turismo 5 will unfortunately only be released for the PlayStation 3, and according to the games developer, likely not before 2010.