Play a new Str8ts game in three difficulty levels every day. The playing field is divided into straights (horizontally or vertically contiguous fields) by means of black cells. Each straight contains a series of consecutive numbers (which can be in any order), eg 2,4,1,3, but not 5,6,9,8 (this lacks the 7). In every row and column, every number from 1 to 9 appears only once. The black cells sometimes contain hints: that number cannot be used in the white cells of that row or column.