I'm so early in the game I just got my first Field Card, but I have no idea what the rules of the card game actually *are*, which is a little frustrating. Sometimes I'm allowed to place cards on the grid, other times not; sometimes the attack grid is 2x3, then it suddenly changes to 2x2; same with the defense grid. Sometimes there's numbers in the grids without me putting cards in them, and I don't know what those numbers mean either. The real-time aspect means I can't look for patterns to learn what's going on, because i'm just slapping cards into holes as fast as I can with no strategy, since I can't make a strategy without knowing how things work. Doesn't seem to be a rulebook in the game menus anywhere, sadly.