El-Even!

Today's Puzzle:

A puzzle set by an eleven-year-old genius? Must be something in the water as Dr. Logic's younger brother sets today's puzzle.

Note the rulesets explained in the video are wrong! The grey circles are odd, not even!

Link to Play Along:

El-Even by Dr Logic https://tinyurl.com/SudokuSleuthElEven

Rules:

Normal Sudoku rules apply. Digits seperated by a black dot must be in a 1:2 ratio. Cells on a grey square are even. Digits along a thermometer must increase from the bulb end. Cells in a cage must sum to the clue in the top left corner, with no repeats. Cells along an arrow must sum to the digit in the circle. Cells on a grey circle are odd!