Yup 3 in any direction i think there are 50 or 52 different ways to win, im currently drawing schematics , i am also trying to get this sold as a toy in both a prebuilt and kit versions from a website like adafruit or MAKE store, the code is also being commented and explained, because it makes heavy use of port manipulation, functions, interrupts and arrays
i have some videos on facebook but i will take some of the finished build and put them on youtube aswell as videos of the code progressing along in the different stages,
the two player games last on average less than a minute and it is mathimatically impossible to get a tie and the 3 player matches last for several minutes unless someone messes up 
Its a surprisingly fun game for anybody that can grasp the addeddimentional challenge, my next game will probabally be 3d connect four