I have been working on a Tetris clone with pieces that consist of 1, 2, and 3 segments. I basically have everything I have planned. But as for the Co-Op mode that I want to add? I have no idea how to approach this. Basically, you and a partner literally share the same grid and work together to score points. But the concepts are scrambling inside of my head, and I need some help making a decision. Here are the concepts I have in mind for the grid: 9x8 Grid w/Shared Lane 9x8 Shared Grid 10x8 Grid w/Shared Lane 10x8 Separate Sides 10x8 Shared Grid Small grids? Yes. Reason? Like I said before, the pieces consist of 1, 2, and 3 segments. To summarize, I'm making a game that's not only simple to play but challenging to master in terms of making a high score. Tell me in your personal opinion what you think works, and why. Any help is appreciated.