PLACEMENT GUIDELINES
At the time of placement, levels must be considered harder than the 25th hardest level on the Impossible Levels List.
The level must be at least 16 seconds long in the editor.
If more than 15 seconds of a level does not contain decoration or gameplay, it will not be counted in the length of the level.
Two-player levels’ difficulty will always be judged on their difficulty to complete solo.
If a level is found to be in violation of any of the List’s rules, it will be Marked for Removal. Levels that are Marked for Removal will have their entries on the List highlighted, and an explanation will be provided in the “Marked for Removal” section of the List. If the outstanding violations are not resolved 1 week after being Marked, the level will be removed from the List.
QUALITY STANDARDS
The level must be fully finished to be placed on the List.
At least 50% of the level’s gameplay or decoration must meet the quality standards of the List team. The quality of each level will be judged on a case-by-case basis.
ls that are largely composed of other existing levels must be made with permission from the original creators, and cannot feature excerpts longer than 30 seconds. Excerpts cannot be repeated more than once.
If the level is significant to the List or impossible level history, exemptions from the Quality Standards rules can be made. The significance of each level will be judged on a case-by-case basis.
PHYSICAL POSSIBILITY
The level must be physically possible and all timings must be passable with start positions.
“Passable with start positions” means that you don’t need frame alignment from 0 to complete it from 0-100
Levels with physically impossible sections after all other gameplay (e.g. end walls) are allowed.
Levels that include swift clicks are allowed, but they will be treated as a regular input.
Timings that simulate randomness are allowed in levels, however the level’s placement will be based on optimal luck.
Segments with click counters requiring over 15cps or sustained for segments over 7 seconds will not be factored into the level's difficulty. Segments must not be over 30cps for segments over 3 seconds, and 45cps for segments over 1 second.
Levels that use uncreative ways to force extreme amounts of difficulty in the same frame aren’t allowed (eg. stacked orbs in Schafs XII by 043)
3.0001 gap is prohibited in the list
In order for your level to get to the top, you or the playtesters need to check the level for physical capability, that is, check it with a gdbot (WITHOUT a NOCLIP)
ALTERNATE VERSIONS
If a level is made impossible by bugs or changes introduced in updates after the level is created, the level can be added with an asterisk as long as it was physically possible in the update it was created in.
An asterisk will also be used if the only published or available copies of the level would need to be fixed to play normally (forced secret ways, auto versions, bugged copies).
If a level is uploaded with the intent to be public by its creator and is later deleted, overwritten, or otherwise lost, accurate reuploads will be credited (e.g. Silent clubstep by TheRealSailent, uploaded by Compendium). Levels that are uploaded but do not fit this criteria (leaks) will not be credited.
If a creator specifically wants their levels or versions of their levels to be excluded from the List, they will be removed and no archival copy will be credited.
If a level is fixed to fit the rules of the list, it can be added and marked as uploaded by the person who fixed the level (e.g. Conjury by Visionari, uploaded by KrXyt).