Depends how you count them. The made at least 6 models and as many as 12 if you count them differently. There are 3 consoles the PS1 PS2 and PS3. There are 3 different PSP models the PSP 1000 PSP 2000 and the PSP 3000 also the PSP Go and PS Vita The Playstation also had a PSOne model and the PS2 and PS3 also have Slim Models
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2 controllers can fit in the playstation2
Many companies are licensed to make Sony PlayStation 3 games and not just a single or a couple
The 1998 PlayStation game Metal Gear Solid, from Konami, comes on two (2) PlayStation format Compact Discs.
The PS2 is still made and sold in many stores.
One can sell an old PlayStation 3 game in many ways. One could either trade in the game for store credit or cash back. One could also sell the games online at Amazon or eBay.