Modern integrated circuits are mass-produced and extremely tiny, but I remember when even products shipped by manufacturers like Sony had internal circuits soldered together, and chips glued glued in place.
Rules:
Normal Sudoku rules apply.
Digits on thermometers strictly increase from bulb to tip.
Cells marked with a green square contain an even digit (2, 4, 6, or 8).
Estimated difficulty: 2.5 out of 5
