To play these levels, extract the .wwd files to your custom directory (usually this is C:\games\claw\custom). Then you can play them by clicking Single Player, and then Custom Levels.
These are the flags:
Big (40 KB or more)
More than one author
Very big (70 KB or more)
Designed for speed runs
Huge (100 KB or more)
Incomplete / Bugged
Gigantic (200 KB or more)
Level description (click to read)
Recommended
Video (click to watch)
A must have!
Requires version 1.4 or higher
Keep in mind that if a bug makes it impossible to finish the level without cheats, it is marked as incomplete, even if there is a checkered flag or a boss fight at the end.