buy a mutitap
About 8 controllers
No, you can't use ps2 controllers to play ps3.
no
YES.
There is a device you can connect to the PS2 to hold 4 controllers.
You can connect up to 7 controllers. And if people want to use the PlayStation Move while playing, (using 2 controllers) you can have 3 people using it, and have 1 person using the original controller, or 2 people using PlayStation Move and 2 people using original controllers, and etc.
PlayStation controllers are by far the better controller of the two. Not only does it fit more naturally in your hand it also comes with a six axis controlling.
2 controllers can fit in the playstation2
Yes they do. It works the same with PlayStation games on PlayStation 2 consoles.
4
Yes they are
Playstation move not supported in ratchet and clank all 4 one. You can only play with regular controllers. The game supports 4 players online and ofline.