Combos can happen after you trigger Plus / Same / Same Wall (which is just Same but walls count as A). If a card is flipped by those special rules, it'll Combo flip any neighboring cards with lower numbers. Combos can chain! (Plus/Same/SWall/Combo don't care about elemental adjustments, by the way. I don't know why they decided to do it that way in the OG, but they did!)
I desperately wanted to have in-game rules primers but had to settle for making some diagrams for the game page instead. I know that some of the rules are kind of just A Lot, hah.
Thanks for playing!