Core
Celeste
Chapter 8: Core is the eighth chapter of Celeste. This chapter introduces various new features, most notably: the inability to recharge dashes (without using a Diamond, or going through a screen transition), and the Crystal Heart Gate. The Crystal Heart Gate blocks the player from accessing the majority of Chapter 8: Core, until certain conditions are met.
Episodes
Start
Start is the first subchapter of Chapter 8: Core in Celeste. The subchapter will be short and mainly exist to block the player's progress with a heart gate which only opens if they have at least 4 Crystal Hearts. Additionally, the subchapter will showcase the main gimmick of Core, being the change in dashing. In this subchapter, the Old Woman is shown to be the one who introduces Madeline to the Core and she mentions the mountain's strange powers affecting her differently.
Into the Core
Into the Core is the second subchapter of Chapter 8: Core in Celeste. The subchapter is the first proper subchapter and introduces Core's main mechanics. The objects introduced in this subchapter are: conveyor walls, fire balls, and launching blocks (and their ice counterparts: ice walls, ice balls, and shattering blocks), ice/magma barriers, hot/cold switches, and hot bumpers. There are no story moments found in this subchapter.
Hot and Cold
Hot and Cold is the third subchapter of Chapter 8: Core in Celeste. The subchapter is mostly just a continuation of the last one with no new mechanics introduced. There are no story moments found in this subchapter.
Heart of the Mountain
Heart of the Mountain is the fourth and final subchapter of Chapter 8: Core in Celeste. The subchapter is composed of two main sections which involve the new and unique rising ice/magma and ice/magma corridors. The first section of the subchapter has rising ice/magma in all of its rooms and the second section has shifting ice/magma corridors which rise up when the Core is hot and descend when the Core is cold. In the final room, Madeline will discover the center of the mountain, filled with new anti-gravity platforms and a vertically wrapping screen, and undo Core's change in dashing. The Crystal Heart of Chapter 8 and the Cassette to unlock Chapter 8's B-Side can both be obtained in this subchapter. The Cassette must be collected to advance forward, and the Crystal Heart must be collected to complete the chapter.

