Mortal Kombat 3 builds further on the gameplay of the previous game. A "Run" button, accompanied by a "Run" meter, was introduced. This was primarily to address concern from fans who thought that the previous games gave too much of an advantage to the defending player. The Run meter is drained by running (the character cannot run backwards, only forwards) and by performing combos.Chain combos, also known as pre-programmed combos (labeled "dial-a-combos") were also introduced. Chain combos are button sequences that cannot be interrupted once one hit connects; some chain combos end with an uppercut or other move that knocks the opponent into the air, so that more damage can be dealt via a traditional juggle combo. To please players of various skill levels, a "Choose Your Destiny" screen appears in the single player mode to allow player-selectable difficulty. For the first time, certain levels were interactive by allowing characters to uppercut each other through the ceiling where both characters would continue the battle in a different stage. This could alter the game's level cycle. Both normal uppercuts and uppercuts that are part of a ground combo would result in a level change. Kung Lao's "Whirl Wind Spin" move would also have the same effect. However, if the character is defeated by an uppercut, there is no level change.