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Stekubi's solution in the other thread can be achieved using matrix field and conditions.
So basically, you will need to have a textbox field which will serve as the output field, a matrix field and form collapse to group the fields you want to display.
Then create the conditions like the following.
Next is to set the PIN. Here's the 2nd condition looks like
This shows the form when the checkboxes checked are 1579.
To explain, the output format of the matrix checkbox is like the following.
You only have to replace the zeros with its equivalent number in place. Example, if your PIN is 1249, you need to use the following in the condition.
Hope this helps. If you need further clarifications, let us know.