C-Sides

C-Sides are extra-challenging levels often found in platformer video games, particularly within the Celeste community. They represent a difficulty tier significantly above the standard A-Sides and B-Sides. Typically, C-Sides are short, consisting of only one or two screens, but demand near-perfect execution due to intricate level design and tightly timed platforming challenges. They often require precise movements, utilizing advanced techniques and a deep understanding of the game's mechanics. Completing C-Sides usually unlocks a small reward, such as a cosmetic item or a checkbox indicating completion. C-Sides are considered optional content geared toward players seeking a substantial test of skill.