The Blameless City

 is a limited time main questline released on November 4, 2015, during the Treehouse of Horror XXVI Event's Act 3.

More infos
(1) The player needs to tap M'nthster 10 times. M’nthster will appear on the screen, at a larger scale, to tap. (2) The player need to deal blows (damage) to M'nthster 10 times. The tasks are done at the Spooky Campfire. Blows are randomly awarded: (3) The player need to tap the Sunken Temple 10 times. M’nthster will appear on the screen again at a large scale to tap at the Sunken Temple. (4) The player needs to tap the Star Spawns 10 times. Star Spawns replace the Nightmares from the previous 2 acts. (5) The player will need to be patient for that 5th part. The player will have to wait until the end on November 17th at 1am GMT to defeat M'nthster once and for all.
 * 5 are rewarded for each tap for a total of 50.
 * This happens only once.
 * Bart, Clockwork Bart, Milhouse, Martin and Lisa rewards 1 or 2
 * The task reward the player with 4
 * Radioactive Milhouse, Wizard Martin, Saxophone Lisa rewards 2, 3 or 4
 * The task reward the player with 8
 * M'nthster health regenerates within 16 hours.
 * 10 are rewarded each time for a total of 100.
 * The Sunken Temple regenerates health within 12 hours.
 * 2 of, , or  are randomly awarded.
 * They spawn from the Spooky Campfire.

End
"Check the Sunken Temple for M'nthster's return and be ready to battle again!"

- In-Game Message