Simple Question. ( I Think )

Does the Blender stand alone game engine support multiplayer ?

Build-in: No
DIY: Yes, with Python

Help: Check the resource subforum

I think Monster’s thinking specifically of online multiplayer. Yes, you’d need to use Python to implement networking and online multiplayer, but local multiplayer is also supported through Python or the logic bricks. Just give the second player character different controls.

Indeed I completely missed splitscreen/single screen solutions. They are possible with the build-in options (shared keyboard/multiple joysticks etc.). But it is up to you how to design that.