Sudoku Cluster is a logic-based number-placement puzzle. It is distinct from but shares some properties and rules with Sudoku and kenken

Rules:

• All classic Sudoku rules apply

• Some cells have numbers written on the top-left corner, Let's call them cluster-heads

• Divide the board into clusters such that

• Each cell belongs to one and only one cluster

• Each cluster has one and only one cluster head

• The summation of the numbers in each cluster must be equal to the number in the cluster head

Cluster Sudoku is like Kenken, with the following differences:

• clusters are not given

• cluster are either horizontal or vertical

• the only operation is add

Below is a solved puzzle:

And here is a sample for you to solve:

Your comments ad feedback is highly appreciated,