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.
Gameplay[]
A big focus of this subchapter is going through rooms in their hot form and eventually going backward through them in their cold form after hitting the hot/cold switch found in the ninth room of the subchapter. This is in order to make it to the fifth room of the subchapter while it's set to cold so the player can bounce on ice balls at the top and continue upward. A skip can be performed to make it to the top of this room while it's hot, but this is very difficult and precise. Going right of the fifth room of the subchapter will task the player with some rooms mostly involving getting through without touching the many fire balls until eventually reaching the ninth room, where a hot/cold switch is found in the middle. Going right from there, the player then goes up and back left in a room above that one before landing back at the left side. Then, the player has to go back through all the rooms until the fifth room of the subchapter from right to left and in cold form.
Strawberries[]
There is 1 Strawberry found in this subchapter (not including the Golden Strawberry which spawns in the first room).
Berry 1
To the left of the fifth room of the subchapter is a room with this Strawberry seen floating far to the left nearby some fire balls. This Strawberry is completely out of reach while the room is hot (though it can technically be obtained with a precise skip) so you'll need to turn the Core to cold and then go back here. The hot bumper above the starting area will have turned into a bumper which can be dashed into diagonally up-right to bounce you over to the ice balls over to the left. Bounce on these carefully to collect the Strawberry, then make your way back right and use your other dash to make it back.