❔ I want to find objects within objects. using composite pattern

Hello I have an sudoku application that can check weither an number is correct or not. The current sudoku formats are regulars (4x4, 9x9 etc), jigsaw and samurai sudoku's. Now I want to check weither an samurai sudoku number is correct. The only problem is that I have build up my sudoku's as followed: regular & jigsaw (so both for example 9x9 grid) : have 27 Clusters with each 9 cells (9 rows with 9 cells, 9 columns with 9 cells and 9 blocks with 9 cells' samurai: have 15 clusters (1 cluster is 1 sudoku because samurai has 5 total sudoku's so times 3 because of the rows, blocks and columns) with children each 9 clusters and there in each cluster has 9 cells. the problem i'm heading is that the check works for regular and jigsaw but not for samurai because of the build. I don't want to change anything to the build but I want to ask how to solve this. Anyone have any idea how I can iterate over the clusters in clusters. I´ve tried recursion but did not work yet