Logic Masters Deutschland e.V.

Title: Forecast: Heat Wave
Type: Sudoku
Link: Penpa+ link to Forecast: Heat Wave You may use Normal/Large/Medium/Small Blue, Green, or Red numbers in any combination.
Link: F-puzzles link to Forecast: Heat Wave
Link: CtC app link to Forecast: Heat Wave
Variants: Thermometer, Heat Map Thermometer

Featured on Cracking the Cryptic, The Rangsk livestream and his own YouTube channel, expert puzzle setter BremSter has created another variant to compliment his Psycho Killer Cages--Heat Map Thermometers. You can find excellent puzzles by BremSter here.

1) Normal Sudoku

• Place the digits 1 through 9 once each in every row, column, and box.

2) Thermometer

• The digits along the grey thermometers must increase from the bulb end.

3) Heat Map Thermometer

• 3.1) The digits along a RED heat map thermometers point to "target" digits. These target digits must strictly increase as if they were on the thermometer.
• 3.2) Target digits are determined as follows:
• 3.2.1) The number of the digit on the thermo points to the box indicated by that number (i.e. a 3 points to box 3).
• 3.2.2) The position of the digit in the original box matches the position of the digit in the box which is pointed to (i.e. a 4 in the top right of the original box indicates that the top right digit of box 4 is the target digit (note some digits can point to themselves)).

You can try a 4x4 example here.