Author: Anders Holst ([email protected]).
In this game you get a table of letters. You should assign a unique number to each letter, and must use all numbers from 1 up to the number of letters (default is all 26 letters), such that all the equations given next to the letters match.
(I have seen this game in several places, as fixed boards, but am not sure about its origin or conventional name.)
You can configure the number of letters to use to be between 6 and 26. 26 is the default.
In the default setting it uses equations using only plus, minus, times and divide. You can add Advanced operators to the clues, which includes square, square-root, pythagoras theorem, and modulo (shown as a percent sign, as in computer programming notation). You can also add Comparisons, adding clues with less than and greater than. You can also choose whether some numbers should be filled in initially or not.
Finally there are a few (approximate) difficulty levels to choose from. The generating mechanism is the same, but it tries to adjust how many redundant equations there are.
There is not so much to say about control. Alphacrypt shares all of its control system with other games where you fill in numbers in squares: Left click to fill in numbers, right-click to fill in pencil marks, walk around with the arrows, etc. To fill in a two-digit number, just write the digits in rapid succession - you have a second to write the second digit, else it will take it as a one digit number.