Most tend to find the Invasions Mode in Mortal Kombat 1 to be an incredibly grindy affair, though, just like every cloud, it does have its silver lining. By playing through each season of Invasions, players can get their hands on a plethora of unique skins and palettes for fan favorite MK1 kombatants, many of which are given as rewards for completing special puzzles known as Klues.