Tips and Strategies
· If you’re not sure a number is correctly placed, holding down the space bar and left-clicking a cell will allow you to pencil in the answer with the option to change it – or make it permanent – later.
· Looking down and across entire rows or columns of the whole grid will help make some number placements much easier.
· If a number turns red, it is a duplicate.
· Search for rows or columns that have the most squares filled in. Determine which numbers are remaining. Scan intersecting columns to narrow down your choices.
· Don’t be afraid to make an informed guess – even the best Sudoku players have to.
· Look for a column, row or 3x3 square on the grid which contains the most numbers. These might be easier to complete.
· When only two or three empty cells remain in a square, row or column, use logic to figure out where the numbers should be place. Be sure to check all intersecting rows and columns so you can rule out numbers already used.
· Every 3x3 square has four other 3x3 squares in the grid which directly affect it.
· Pencil in all the numbers that could be entered into a specific cell and, using logic and powers of deduction, gradually eliminate them until you are left with the correct answer.
· Once you have filled in seven of nine numbers in a row, column or grid, check intersecting rows or columns to determine where the leftover numbers should be placed.