First of all: Looks amazing! But... I am unclear about the rules. I do get the basic idea, but what do the extra rules do? 

Sudden death is explained in the demo...

Those, are completely unclear to me:

• Plus rule
• Same rule
• Combo rule
• PlusWall rule
• SameWall rule

Anyhow, nice work. I would probably like to use this, if I understand all the rules. 

Hey friend! no problem!

You can find them here: https://finalfantasy.fandom.com/wiki/Triple_Triad_(Final_Fantasy_VIII)

There was another site that I am not finding that had visually them being explained, but if something is not clear there, you can tell me :)