Alternate sides

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In Celeste, B-Sides are essentially harder versions of the levels. A B-Side for a given level becomes accessible when a Cassette Tape for that level is collected.

Like A-Sides, B-Sides are segmented into checkpoints.

At the end of each B-Side is a Cassette Block room, the only room in the level in which Cassette Blocks are used. At the end of it is a Red Crystal Heart, and dashing into it will complete the B-Side.