Standard Chess, except that each square accepts two playing pieces.

A Reversi style game from Tibet.

Standard Checkers, except that each cram square accepts two playing pieces.

Standard Reversi, except that each cram square accepts two playing pieces.

Relign the 9x9 grid's 3x3 sections, to match regular* Sudoku solution rules.

A known two-deck Solitaire (Patience) game.

Numbers are restricted from occupying the same relative positions within other 3x3 sections.

Sudoku variant in which added total figures are provided for their nearest three squares in a row or column.

CircleSquare numbers (1,2,3 - 4,5,6 - and 7,8,9) are restricted to their outline shapes.

Greater Than variant markers inform of adjacent missing number values.