This puzzle was created for the April 2021 monthly puzzle prompt in the CtC fan discord server. The theme was Fool's Gold.
Casket of Gold
• Each row, column and 3x3 box contains the digits 1-9.
• Digits along a thermometer increase from the bulb end.
• Clues outside the grid are the sum of the digits between the 1&9 in the row or column.
• Some of the outside clues are hidden by golden nuggets. For each nugget that is real gold there is exactly one other nugget hiding the same number. One of the nuggets alas is ‘fool’s gold’ with no matching value.