Boss Bat Quest

Unlock the three closed-off sections in The Bat Hole, using one or a combination of the following methods:
- Using a sonar-in-a-biscuit from inventory unlocks one sidezone. This is a 10% or 15% drop from monsters in the three central zones in The Bat Hole.
  - : Adventuring in Guano Junction with a ten-leaf clover yields 2 sonars-in-a-biscuit, if no others are in inventory.
  - : (2015) The 5-combat Hallowiener Dog encounter in the Guano Junction drops a sonar-in-a-biscuit.
  - : (2019) Eating a diabolic pizza made with a combat item may yield 1 sonar-in-a-biscuit.
  - : The Giant Trash Quest requires an enchanted bean, a 50% drop from the beanbat in Beanbat Chamber (3 monsters).
- Defeating a screambat unlocks one sidezone. The screambat appears in zones that drop sonars-in-a-biscuit, as the 9th overall encounter and every 8 encounters after that.
  - : (2020) Having the skill Comprehensive Cartography allows the first non-combat here to lead to a screambat fight.
- : (2014) Using a snow shovel unlocks all three sidezones.
Adventure in The Boss Bat's Lair and defeat the Boss Bat.
- : The Boss Bat has a delay of 4-6, rolled randomly each Ascension.
Return to the Council of Loathing to complete the quest.