Note that on the screen you are told what options you have and exactly which key to press to accomplish those options. The entire program uses this as its main design philosophy

Pressing [ENTER] will tell you if your solution is correct. You will return to the puzzle if it is not.

Pressing [ESC] will cancel this solution.

Pressing [F1] will show you multiple topics of help.

The object is to change the lowercase cyphertext letters into uppercase plain text letters. You tell the program how you want a letter changed and it will change all occurences of that letter in the cryptogram for you.

It will also remove the letter from the cyphertext line and add the new letter to the PLAINTEXT line so that you will always know which letters still have to be changed and which letters still have to be found.

The FREQUENCY line tells you the relative frequency of each cyphertext letter with the most frequent on the left.

Other parts of the program allow you to enter plaintext, will encypher it for you, and then save it to the file. 999 cryptograms per file and 138 files per computer disk.

You may also print out either a cryptogram to be solved on paper or mailed to someone else, or you can print out the plaintext of a cryptogram.

You may either allow or prevent the program to solve a cryptogram for a student if he gives up on solving it himself.