A brief note an how to play: All the tiles you must place on the grid are of length 5. They will only 'fit' into the left or right end of a series of blank; for example, for a row of seven, one 5-tile will fit into positions 1-5, another will overlap it, fitting into positions 3-7. Of course, positions where 5-tiles overlap must be of the same color.

There are a number of settable parameters in the options menu, allowing you to choose the size of the blocks, the number of tiles, the number of colors, the number of positions already placed for you, and the number of 5-tiles that don't belong on the board.

The Crosses at the bottom allow you to 'label' the XTile that you have added; for example if you are unsure of a pick, but investigating it, you can drop the yellow cross on it and it will outline in yellow, allowing you to remember where your uncertainties lie. The black cross reverts XTiles it is dropped on to normal.

The point of the exercise is to develop reasoning skills and make the player confront creation and testing of hypotheses and examination of assumptions.

I know that the layout of unplaced tiles isn't optimal and the colors aren't the greatest; obviously colors could be replaced by small pictures, but we don't want me going there...