by dugman
My brother and I have played a bunch of times with a simple north-south east-west partner system. We each control two monsters and play them normally. The first person to have either of their monster's win the game is the winner.Very simple and it works great with almost every game being very close. There's also some tactical choices you sometimes have to make, such as deciding whether or not to have one of your monsters yield Tokyo to your other monster on an accidental hit. It also alters some of the powers overall effectiveness a bit up or down, though in an interesting way as opposed to making things unbalanced (at least as far as we can tell.) For instance abilities like Acid Breath are still really good but if you're Tokyo it does mean that your other monster will take damage, and the Healing Ray (or whatever it's called) that lets you heal other monsters is nice in this variant because it allows you to have one of your monsters heal the other.
Anyway I highly recommend this easy tag-team two player variant. Just my opinion.