Normal sudoku rules apply.
The lines in the grid are overlapping thermos.
Every other cell along these lines has to strictly increase or decrease in value.
No bulbs are given. The orientation of the thermos must be deduced by the solver.
The grey squares must contain even digits.
The grey circles must contain odd ddigits.
The grey cells with inequality signs pointing out from them must contain digits greater than the orthogonally adjacent cells.
Solve on f-puzzles