Arba, which is four in Hebrew, was a game I made after hearing a general description of another game called Quattro.
The rules are quite simple, you just have to place four pieces with a common trait in either a line or a square and you win. The twist is you don't get to pick the piece, your opponent does.
The traits are round, square, high, low, hollow, not-hollow, black and also white. (or what ever two distinct colours you use).
It is played on a 4x4 board (in my case the bag that i have the pieces in also double as a board.).
Rules and expansions
Rules
Arba Ghosts: a modification/expansion.