Sudoku 4 in 1

Challenge intellect by tackling four distinct Sudoku modes within one digital arena. Select between classic, diagonal, irregular, or killer variants—each demanding unique strategies and pattern recognition skills. Manipulate a 9x9 matrix; populate every cell with digits 1 through 9 while preventing numerical echoes across rows, columns, and boxed clusters. Shuffle tactics frequently as grids morph in complexity from novice-friendly layouts to mind-bending expert conundrums. Adjust difficulty for gradual progression or instant brain burn depending on preference. Pinpoint mistakes swiftly using built-in hint systems or test pure deduction prowess by disabling assistance altogether. Rotate between logic-driven formats to spark fresh neural pathways and refine analytical abilities with each completed board—a true cerebral gauntlet where only the sharpest minds consistently solve every permutation offered!