Samurai
Overlapping sudokus — shared boxes must satisfy both.
Several sudokus share boxes — the digits in the shared boxes must satisfy both puzzles.
839671254569317842514928637438265179267354198721984536983167425176423958652843971895176324741295386243598761375419862143957842613196782543798612739485428536719265384651297357426891184379265296581743637184925834176543289984532671952438129576215976438617529687134451829763894261357729613584613475928368745192257938641896251347781356492542397816362894715173468259945712863