Examples of clues: Simply write in a GPS location such as “N 32° 06.789 W 090° 04.473
Examples of clues: Give parts of coordinates such as N 32° 06.789. To figure out the next three, locate a particular book and ask them to give the call number, page number, date of publication, etc.
Examples of clues: Make a cryptogram where one letter is replaced by another. Example: HKFN EPHHO JI ICNO JK M