No, Just Cause 2 does not require Steam. It can be bought on a disk for various consoles, including the PC.
2010
It works on the DS, DS lite, and the DSi game consoles, it works the same across all consoles. From what I know it wont come out one anything else...
Just 2.
Just Cause 2 was released on the 23rd of March, 2010 for North America and the 26th of March for Europe.
about 4 years ago
No, it was exclusive to consoles, xbox 360 and PS3.
At the moment there is only Just Cause 1 and 2. Just Cause 3 does not exist YET! There have been a lot of rumours to when it will come out in the future, they say within the next couple years.
Just Cause is for the PS2 and Just Cause 2 is for the PS3
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Just Cause 2 'Classics' is just a category it was placed under.
There are no zombies on Just Cause 2.