2D Co-Op?

I have a Idea for making a Co-Op game but i want it to be on 1 keyboard like fighting each other can someone help me? i need to have 1 more player with differnt movement keys

 

Start here.

 

Based on your message I assume you already have a game with 1 player object that can move around your scene based on keyboard input. At the most basic level, all you need to do is duplicate that same player object in the scene, create a new input script called something like 'player2input', copy paste your existing input code and just change which keys need to be pressed and then attach that to your second player object after removing the first input script from it.

There are of course better ways to do this, but it would be a starting point.