Fill the grid with the numbers 1 through 9. In rows, columns and 3x3-boxes no number can be repeated. Additionaly place areas of the size 3x3 in the grid. It is not allowed that these areas overlap. Each of these areas contains at least one star. In the middle cell of such area can't be a star. Moreover each star is part of exactly one of these areas. In these areas also no number can be repeated.

Locate the position of a 10-ship fleet in the grid. The shapes of the ships are shown to the right of the grid. There is one 4x1 battleship, two 3x1 cruisers, three 2x1 destroyers and 4 1x1 submarines. The numbers beside the grid indicate the number of cells occupied by ships in each row, while the numbers below the grid indicate the number of occupied cells in each column. Ships may touch the edge of the board, but cannot touch each other, not even diagonally. Additional each cell has a number from 1 to 9. Place the digits so that each digit appears exactly once in each of the rows, columns and the nine outlined 3x3 regions. Cells with ship parts can only contain even numbers.

Locate the position of the five T-formss in the grid. The T-forms do not touch each other, even not diagonally. The numbers outside the grid indicate how many cells in that row or column contain parts of the T-forms. The T-forms can not occupy the cells with given digits. Fill the grid also that every row, every column and every 3x3 box contain the digits 1 through 9. The T-forms contain the numbers given right of the grid. The forms can be rotated, but to reflected.

Locate the position of a 10-ship fleet in the left grid. The shapes of the ships are shown at the bottom of the left grid. There is one 4x1 battleship, two 3x1 cruisers, three 2x1 destroyers and 4 1x1 submarines. The numbers around the left grid indicate the number of cells occupied by ships in each row or column. Ships may touch the edge of the board, but cannot touch each other, not even diagonally. Additional each cell in the right grid has a number from 1 to 9. Place the digits so that each digit appears exactly once in each of the rows, columns and the nine outlined 3x3 regions. The numbers in the cages of the right grid are the sum of the cells in the cages. Cells with ship parts in the corresponding left grid can only contain odd numbers.

Locate the position of the 10-ship fleet in the grid. The ships do not touch each other, even not diagonally. The numbers outside the grid indicate how many cells in that row or column contain parts of ships. The ship can not occupy the cells with given digits. Fill the grid also that every row, every column and every 3x3 box contain the digits 1 through 9. The ships contain the numbers given right of the grid. These numbers go from left to right, from right to left, from top to bottom or from bottom to top.

Connect in the left grid all dots in pairs in such a way that all cells are filled. Each straight line must be at least 2 cells long. After that fill in the right grid so that every row, every column and every 3x3 box contain the digits 1 through 9. If two cells are in the left grid in the same path (snake) then the corresponding cells in the right grid must be different.

Connect in the left grid all dots in pairs in such a way that all cells are filled. Each path (worm) has to make a 90 degree turn in every cell it travels through and must contain at least one turn. After that fill in the right grid so that every row, every column, every 3x3 box and both diagonals contain the digits 1 through 9. If two cells are in the left grid in the same path (worm) then the corresponding cells in the right grid must be different.