Normal sudoku rules apply. Along a thermometer, digits increase from bulb to tip. Digits along an orange arrow average exactly to the digit in that arrow's circle. Multiple arrows extending from the same circle are treated as different arrows each averaging to the circled digit. For example, a circled 3 could have 15 on one of its arrows, and 24 on the other, because both arrows would average to 3. For clarity, 'average' in this puzzle refers to the arithmetic mean.