[6] Since the Fill-In requires no outside knowledge of specific subjects,[7] one can solve the puzzle in another language.
To solve the puzzle correctly, the solver must find a solution that fits all of the available words into the grid.
[2][3][4] Solving a Fill-In typically amounts to searching for words of a certain length with letters in specific places.
Forgetting to do this results in "extra words" and often makes the puzzle more difficult to solve.
[1][8] In this puzzle, the entries could be listed as the number, a mathematical expression, or even an important year.