Invasions Mode can be a bit of a grind for Mortal Kombat 1 players, particularly when tackled in a single sitting. Thankfully, among this seemingly endless repetition, players can find numerous distractions, from time trials to combo challenges. However, the most popular form of side content in Mortal Kombat 1 are Klues, which require players to complete an Invasions node while also meeting cryptic conditions.