Kids going on a treasure hunt with a riddle

Looking for a movie back in the 90’s I believe, It’s definitely not The Goonies.
It’s about kids going on a treasure hunt and they have a riddle to follow and somewhere like the dessert. Very vaguely remember. Brings back my childhood. Please find this !! :frowning:

Not a perfect match, but maybe
“Midnight Madness” (1980)?

How old are the kids, how many they are? What kind of desert, like the Sahara or Arizona?

The Treasure of the White Falcons (2005)?

“The Famous five 4”?

Could it be “The Treasure” 1990?