simple version of minesweeper

As an assignment I need to make a program or 'game' like minesweeper. We will use several layers to build up the game. Can anyone explain to me how I make a 10 x 10 matrix with blocks filled with only grey, and gridlines on either side.

 unclicked = zeros (10,10) - 1;      % clicked buttons are -1
 unclicked_gray = 0.8 * [1 1 1];
 clicked = ones (10,10) - 1;         % clicked buttons are 0
 clicked_gray = 0.5 * [1 1 1];
 clf;  
 unclicked_matrix(10,10,1:3) = [ 
 0.5 0.5 0.5
 ]; 
 image(unclicked_matrix) 
 axis off;
 grid on;

I am trying something with this, however I don't know how to combine the variables and whether the variables are even usefull. The image I fill in only shows a few grey blocks and I don't know why. Thank you in advance!

[Gopichandh Danala]

Do you mean something like a black image with a grid boundary around it in a different color? if so try this..

   tab = ones(10,10)*0.5;
   tab(:,1) = 1;
   tab(:,10) = 1;
   tab(1,:) = 1;
   tab(10,:) = 1;

   figure, imshow(tab,'InitialMagnification','fit');