Chill Hills

 is the sixth world that the player will encounter during a run. Pyro Droids fittingly do not appear naturally, while Cryo Droids and their upgraded variants are much more common. This world features a lot of ice-related gameplay, having to use Freeze Buttons to toggle between ice and water. Rapid-Fire Droids and Switch Droids make their first appearance in this world, although Switch Droids are quite uncommon in Chill Hills.

Environment
Chill Hills resembles a polar area. It has a white, snowy ground and gray cobblestone walls that are tinted blue. Environmental objects include ice blocks and igloos with possible friendly droids inside them. Freeze Buttons are fairly common in this world.

Chill Hills's environmental hazard is water. The water found here is identical to that in Lush Jungle. However, some water bodies in this world are naturally frozen.

Ice blocks appear in Chill Hills. They are a type of environmental object that can be frozen and melted, but do not deal any damage to the player when collided in water form. When melted, they look similar to water and do not collide with anything. When they are frozen, they become a solid obstacle. They can be used to block projectiles and in some cases lose droid aggro. Ice blocks normally come in a cuboid shape, but there are also conical ice blocks found in Chill Hills.

Tips

 * Having ice resistance will make this world much easier.
 * You get full immunity from water hazards, snowball projectiles from Arctic Droids, and icicles spawned by Cryo Droids.
 * Always be aware of ice physics. Ice will always be slippery.
 * Do not attempt to jump on Hunter Droids on ice.

Trivia

 * There is a room where an igloo spawns. Inside the igloo is a Friendly Droid.
 * The song that plays in this world is called Sonic 3 OST - Ice Cap Zone Act 1.
 * Chill Hills had an older soundtrack, which was The Binding of Isaac - Innocence Glitched.
 * Before (non darkness) bosses were added in 1.5, this was the only world to have rooms that spawned with water/lava already frozen