Silent levels

The Silent Levels (Also known as the Impossible Levels) are the custom levels in-game which difficulty is beyond the player's own skills and abilities, despite being as 'Silent' levels, these levels are either near-on physically impossible or humanly impossible... Near-on physically impossibles are the type of silent levels which are only possible with cheats but, can be passed in practice mode, while the Humanly impossible are the ones that are extremely impossible, most of them involves around, extremely tight spaces, sheer difficulty, block mazes, confusing path, and bugs.

Most Silent Levels are verified by Secret ways, while some are being verified by speed-hacking and some are verified via altering the game's files... However, due to Update 2.0's speed-hack patch, it is impossible to verify an impossible level with it, so far file altering is the only way nowadays.

Origin
The origin of the silent level began in a simple 1.6 creator named as 'Play 1107696', who was the creator of the notorious level named Alphabet X, an insane demon which was beaten by Zobros back in May 2015. He has uploaded also a level called Silent Club, an insanely hard Clubstep remake, hence the name. The level was used to be rated demon, however until Cyclic found a hard-to-reach secret way in the level, which caused it to be downgraded. After then, a player by the name of Sailent aka Nautilus2k has started his own career of making silent levels, he has created several impossible levels including Deadly Clubstep v2, Silent Clubstep, etc. As time goes by, a few creators started to create their own impossible levels.

Design
Silent Level designs are vary depending on their creator's choice... They were either a Nine Circles, a Hellish-themed levels, some are extremely dark that almost impossible to see what was going on.

List of Silent Levels
Please help contribute into this list, by adding a few more levels.

The chronological list of every Silent Levels published, note that levels like Very Easy and Red World (which were impossible due to a bug) are excluded in this list.