Gattai 25 Shaolin

My first generated arrangement of 25 overlapping Sudoku's. 22-apr-2018

Symmetrical and of course all overlapping area's are clueless.

In the most difficult version with 7 adjacent boxes in the middle bands (TWICE) .

Techniques to solve this: 

A. Box <-> Columns,Rows

"if a column or row hold same candidates in exactly 1 box, remove candidates from that box, 

 but not on the column or row, and visa versa (pointing pairs)"

B. Naked/Hidden Pairs/Triples/Quads

"if a set (box,column or row) holds N candidates in N cells, all other cells in set can eliminate those candidates"

The S(imple) puzzle does not need special techniques.

To download: In excel format:  link (all in a excel with solver and all examples included on separate sheets)

As a .txt file: link S, link A, link AB  (3 files)

Took about 2 hours for the X puzzle and 4 hours for the AB puzzle to be generated on an Intel I5.

The  .txt file holds all lines with 81 digits. The first line is added for SiSeSuSo with the arrangement. This file can be read by SiSeSuSo.