USE CURSOR KEYS TO SCROLL TEXT. USE CURSOR KEYS TO SCROLL TEXT. Tiles. Tiles. YJ2 has asked for an explanation of the TILES program on issue 22. Here is an attempt to explain the one liner step by step: Text in RED is taken from the actual program. MODE1:CLG Selects a four colour mode and clears the screen. FORx=20TO1230STEP62 This is the outer loop which prints the columns across the screen from left to right. FORy=20TO900STEP62 This is the inner loop which prints each individual column from bottom to top. This next section is responsible for printing a single tile by drawing a white box and filling it: GCOL0,3 Select graphic colour white. MOVEx,y DRAWx,y+50 DRAWx+50,y+50 DRAWx+50,y DRAWx,y Draw the box. GCOLRND(8)*RND(8),RND(4) Select a graphic colour at random. PLOT133,x+10,y+10 Plot 133 flood fills from point X,Y until non background is found. Therefore, if point X,Y lies inside a box, the box will be filled. NEXT End of column. NEXT End of screen.