Normal Sudoku Rules apply. 10 different pentominos must be placed in the grid, not over given digits. Each pentomino touches exactly two other pentominos orthogonally and they form a loop, so a path could be traced orthogonally around all 10, but each pentomino may only touch another on one edge of one cell. Pentominos act as killer cages in which digits may not repeat, and corner clues in the grid indicate the sum of the pentomino’s digit or its shape.