It was those extra letters, his golden century, which had delayed Kjelstrup.

Each word has three extra letters added in; the first and last letters are always correct.

A four-letter word appears on the screen, along with an extra letter.

Whether answered correctly or not, that extra letter is placed into its location in the main question.

An entire extra letter could fit in between each letter.

The use of the extra letters is mainly a question of prestige.

Once enough keys are known, the user can access a custom built lesson to work those extra tough letters.

Featuring comments in extra big letters is an insult to their intelligence.

In case more than one character correspond to the same code, an extra letter can be added for selection.

So why have an extra letter at the end?