Mortal Kombat 1's Invasions Mode can be incredibly enjoyable, but it can also start to feel a little repetitive after a while. Thankfully, there are a few things that can help to break up the monotony a little, one of which is Klues. These serve as simple yet sometimes challenging puzzles that reward Mortal Kombat 1 players with unique and useful rewards, including time-limited cosmetics and Invasions Mode items.