IRO is a puzzle game that combines puzzle elements with match three gameplay. Each level has three slots. You must match the slots to create combos in a set number of moves. Each set of three pieces that you match increases your score and you get a combo multiplier.IRO is a puzzle game that combines puzzle elements with match three gameplay. Each level has three slots. You must match the slots to create combos in a set number of moves. Each set of three pieces that you match increases your score and you get a combo multiplier.