Gade

A "Gade" is a method, invented by the geocacher of the same name, to calculate the collected digits in the answer to a challenge into a solution by means of a formula that can be revealed beforehand.

The method is relatively simple: The collected digits are sorted, the missing digits added and each digit is assigned to a variable. The variables are now substituted into the formula, yielding for example the final coordinates to the cachebox.

The major advantage is that the formula is very simple to construct, since there will be at least one variable containing each digit (including zero).