乘积箭头 Product arrows Sudoku

标准数独基础上标示出的方格或长方格由1个、2个或更多数字组成一个数，这个数必须等于在箭头及其路径上所有数字的乘积。

Classic rules applied. Additionally, marked circle with 1, 2 or more digits form a number that must be equal to the product of the digits that appear along the path of the arrow.

The puzzle comes from Krtek's Cup-164

赛事频率 极低

出现在极少数赛事中，但是出现时可能多以高分题形式出现。