Stone Sanctuary

 is the alternate world that a player will encounter in a run, replacing Mount Whirl. It has a 50% chance to appear instead of Mount Whirl if the player has beaten Mount Whirl without taking damage and unlocked the badge, "Unlock Stone Sanctuary". It was originally a temporary alternate world during the Easter Event, but re-added into the game on Update 1.5, and is here to stay as an alternate world permanently. It features many tight spaces, making it harder to fight droids. The Statue Droid is the world-exclusive droid of this world, and you will encounter more advanced droids compared to the previous world.

Environment
Stone Sanctuary has a pale, white cobblestone path with lush, green grass walls. Ordinary environmental objects such as flower beds and climbable trusses can be found.

The unique environmental objects of this world are droid statues. Droid statues are a gray, slate pedestal with a faceless, gray slate droid on it. While they may seem harmless at first, but normally when the room is cleared, there is a chance of a statue awakening, which awakens the droid, and becomes a Statue Droid that the player must defeat to actually clear the room. Multiple statues may awaken in a single room, causing multiple Statue Droids to spawn.

Tips

 * Be mindful of your surroundings as a droid statue may awaken near you without you knowing, and might cause you to take huge damage.
 * Most of the rooms have little space to move around, so be careful when circling droids.
 * Droids can climb trusses, so do not aggro a droid onto a truss otherwise it will climb up and still chase you (this has always been possible, even in elemental, so nothing unique).

Trivia

 * It is possible to never encounter this world even with the badge unlocked by disabling "Alternate Worlds" in the settings.
 * This is the first and only alternate world to not contain any environmental hazards.
 * This is the second alternate world added to the game, just after Gingerbread Glaciers.
 * This is not accounting for the re-addition of the alternate worlds in Update 1.5.