version 5 by Aaron Reed
Part - Puzzles and Tasks
Chapter - Puzzles
A puzzle is a kind of thing.
Requiring relates one thing (called the requiree) to various things [puzzles or tasks]. The verb to require (he requires, they require, he required, it is required, he is requiring) implies the requiring relation.
A puzzle can be sequential. A puzzle is usually sequential. A puzzle is usually privately-named. [The children of a sequential puzzle must be solved in the order they are defined in the source; the children of a not sequential puzzle can be solved in any order.]