I invent simple version of Game of Y). You play three games of Y at once on one board. Every stone has three features. You can try this game on website http://ranka.mobi/yyy. More in forum YYY on BGG.
It would be better - in my opinion - to keep the original idea of different colours for the 2 sub-games and shapes for the 3rd.
Say the current blue-orange scheme for the 1st subgame (external circles), white-black for the 2nd (internal circle) and a small shape (light blue square / light orange circle or similar) for the 3rd subgame.