Ninja Revolution character help

[ThePowerOfOne]

I saw how to unlock characters like Orochimaru, it said you need to complete Single Player with Sasuke, Naruto, Kakashi, and someone...

So does that mean all in a row? Or you can use Naruto, a few hours later Sasuke, and so on?

[Water ☮]

the latter

[ThePowerOfOne]

Ok, I got all the characters but Shino and Itachi. But it says I need to beat Arcade mode with Kankuro to get Shino. And beat the mission where you have the rematch with Itachi after unlocking all other characters to get Itachi.

But I can't find Arcade Mode and only have missions 1-19. So how do I get Arcade Mode and more missions?