Our interactive Logic Problems have two parts; the grid is to help you
solve the puzzle and the table is for your final answers.
The Interactive Grid
This grid is provided to help you solve the logic problem. This grid
can be used in the traditional method, using dots and x's. For tips on
how to use this grid, click on the Solving Tips button or follow the
Solving Tips page link found on the main puzzle page.
Identifying a Cell
By moving your cursor over any of the cells in the grid, the
associated horizontal and vertical rectangles are highlighted in
yellow. These identify the match you are currently checking.
Filling in the Grid
The first click of the left mouse button over any cell of the grid
will put an x in the square.
The second click of the same cell puts a red
ball in it.
A third click of the same cell clears it.
Suggestions for Filling in the
Fill the cell with an X when you
determine that the combination in that cell is false.
Fill the cell with a red ball when
you determine that the combination in that cell is true.
Leave the cell blank if you're not sure whether the combination is
true or false.
Clearing the Grid
If you have partially filled in the grid and decide you want to start
over, click the 'Clear Grid' button. This will remove all the entries,
leaving a blank grid.
Table of Results
Use this table to keep track of your answers. When the table is filled
in, the puzzle will tell you if you solved it correctly.
Below each column of the table is a list of the variables that may be
entered into that column. You cannot enter any variable into any
column. Only the items directly underneath the column may be entered
into that particular column.
Filling in the Table
To enter items into the table, click the item you want to enter and
note that it is now highlighted in yellow. Move your mouse to the cell
you want it entered and click the mouse button again. The item will
disappear from the list below and is now displayed in that cell you
If you have entered an item into the table, but put it in the wrong
row, it can be moved. Simply click the item and then click the new
cell location. The item will change places.
Clicking the Clear Table button will move all of the items out of the
table and back into the lists below the table.
To move a single item out of the table, click the item so that it is
highlighted in yellow then click one of the dashed lines below that
column of the table. The item will return to the list below the table.
Note that the column rules still apply.
Solving the Puzzle
Every row of the table makes a complete set of matches according to
the clues. When all the rows of the table are completed correctly, a
congratulation message is displayed.