#1 - French Revolution: from 1789 to 2021
French Revolution: from 1789 to 2021 Standard Sudoku rules apply. Thermo : digits strictly increase along thermometers starting from the bulb. Arrow : the digit in the circle is the sum of all digits along the arrow. X-Sums : each number on the left side of the grid is the sum of the X first digits where X is the first digit seen in that direction. Sandwich : each number above the grid is the sum of the digits that are sandwiched between 1 and 9 in the corresponding column. Penpa link to solve online: https://git.io/JCqbr