A little bit of ambiguity in the rule description messed me up. When it says "Up to 2 cards can be placed sideways onto any other card," It doesn't mean up to two cards can be placed sideways onto a single other card as many times as the player likes, instead it means, up to two single cards can individually be played onto non-sideways cards over the whole board at once. I was wondering why sometimes the game wouldn't let me place a sideways card until I parsed it correctly.