diff --git a/src/columns.c b/src/columns.c
index 171aaf7..426509a 100644
--- a/src/columns.c
+++ b/src/columns.c
@@ -10,79 +10,8 @@
 #include <SDL2/SDL_image.h>
 #include <math.h>
 #include <stdbool.h>
-#include "sprite_sheet.h"
-#include "text.h"
-#include "ascii.h"
+
 #include "game.h"
-
-enum gradient {Blue = 0, Green = 10, Red = 20, Yellow = 30, Magenta = 40, Cyan = 50, Grey = 60} colour = 0;
-
-int backdrop (enum gradient colour);
-int check_key(void);
-int Ren_restart(void);		// game over/restart
-int Ren_pause(void);		// pause
-int Ren_game(void);		// render game
-int Ren_logo (void);		// display logo
-int Ren_about (void);		// display about
-int Ren_info (void);		// info screen
-int Ren_menu (void);		// main menu
-int Ren_level (void);		// display level / current score
-int Ren_next (void);		// display next block/brick/piece
-int Ren_high (void);		// display high scores
-int Ren_line (char line[], int char_x, int char_y, int ln, int ll, bool col ); // parameter names in function prototypes not necessary 
-int initSDL (void);		// initialise SDL
-int shutdownSDL (void);		// shutdown SDL
-int render (void);		// render output
-int init_gfx (void);		// create texture
-int i, j, k, x, y, z, l;  	// index variables
-int gamep = 0;
-int tile_c;
-int tile_pos = 112;
-
-bool next_p = false;		// next piece flag
-bool quit = false;		// quit flag
-bool main_m = false;
-bool pause_f = 0;
-
-SDL_Window *window = NULL;
-SDL_Renderer *sr;
-SDL_Event event;
-SDL_RWops* rwops_new;
-SDL_Surface* image;
-SDL_Texture * texture;
-SDL_Rect logo_src = { 384, 0, 78, 54 };
-SDL_Rect logo_dst = { 230, 136, 78, 54 };
-//SDL_Rect char_src = {463, 0 , 7 , 5};
-//SDL_Rect char_dst = {22, 11 , 7 , 5};
-SDL_Rect main_back = {110, 0, 100, 200};
-SDL_Rect main_trim = {111, 0, 98, 200};
-SDL_Rect level_back = {231, 7, 76, 66};
-SDL_Rect level_trim = {230, 6, 78, 68};
-SDL_Rect next_back = {257, 86, 18, 37};
-SDL_Rect next_trim = {256, 85, 20, 39};
-SDL_Rect high_back = {13, 7, 76, 186};
-SDL_Rect high_trim = {12, 6, 78, 188};
-SDL_Rect tile_src = {132, 0, 12, 11};
-SDL_Rect tile_dst = {112, 1, 12, 11};
-SDL_Rect gameo_back = {119, 93, 82, 13};
-
-/* window paramaters */
-#define WIDTH 1280		// pixels
-#define HEIGHT 800		// pixels
-#define TITLE "FUN COLUMNS"	// window title
-
-/** board background colours **/
-int grad_tab[] = {
-
-	0x0000cc, 0x0000bb, 0x0000aa, 0x000099, 0x000088, 0x000077, 0x000066, 0x000055, 0x000044, 0x000033, // blue
-	0x00cc00, 0x00bb00, 0x00aa00, 0x009900, 0x008800, 0x007700, 0x006600, 0x005500, 0x004400, 0x003300, // green
-	0xcc0000, 0xbb0000, 0xaa0000, 0x990000, 0x880000, 0x770000, 0x660000, 0x550000, 0x440000, 0x330000, // red
-	0xcccc00, 0xbbbb00, 0xaaaa00, 0x999900, 0x888800, 0x777700, 0x666600, 0x555500, 0x444400, 0x333300, // yellow
-	0xcc00cc, 0xbb00bb, 0xaa00aa, 0x990099, 0x880088, 0x770077, 0x660066, 0x550055, 0x440044, 0x330033, // magenta
-	0x00cccc, 0x00bbbb, 0x00aaaa, 0x009999, 0x008888, 0x007777, 0x006666, 0x005555, 0x004444, 0x003333, // cyan
-	0xcccccc, 0xbbbbbb, 0xaaaaaa, 0x999999, 0x888888, 0x777777, 0x666666, 0x555555, 0x444444, 0x333333  // grey
-};
-
 // ============= Main =============
 
 int main (void) {
@@ -355,22 +284,56 @@ int Ren_logo(void) {
 	return 0;
 }
 
+
+// ============= display play field =============
+
+int display_grid()
+{
+	tiledst_y = 1;
+	for (i = 0; i < 18; i++) {
+		tiledst_x = 112;
+		for  (j = 0; j < 8; j++) {
+			k = grid[0][i][j];
+			tile_shp = 1; // tile shape
+			tilesrc_y = 0;
+			if (k > 0) {
+				k--;
+				tilesrc_x = spr_x[tile_shp][k];
+				tile_src.x = tilesrc_x;
+				tile_src.y = tilesrc_y;
+				tile_dst.x = tiledst_x;
+				tile_dst.y = tiledst_y;
+				SDL_RenderCopy(sr, texture, &tile_src, &tile_dst);		// draw colour tile
+			} else {
+				tile_dst.x = tiledst_x;
+				tile_dst.y = tiledst_y;
+				SDL_SetRenderDrawColor(sr, 0x0 , 0x0 , 0x0, 0xff);
+				SDL_RenderFillRect(sr, &tile_dst);		// draw empty tile
+			}
+			tiledst_x = tiledst_x + 12;		// next column
+		}
+		tiledst_y = tiledst_y + 11;		// next row
+	}
+	return 0;
+}
+
 // ============= Game =============
 int Ren_game(void) {
 	SDL_SetRenderDrawColor(sr, 0x0 , 0x0 , 0x0, 0xff);
 	SDL_RenderFillRect(sr, &main_back);			// background
 	SDL_SetRenderDrawColor (sr, 0xff, 0xff, 0xff, 255);
 	SDL_RenderDrawRect(sr, &main_trim);			// trim
-	if(tile_c > 17) {
-	    tile_c = 0;
-	}
+//	if(tile_c > 17) {
+//	    tile_c = 0;
+//	}
 
-	for (i = 0; i < 1; i++) {
-		tile_dst.x = tile_pos;
-		tile_dst.y = 11 * tile_c + 1;
-		SDL_RenderCopy(sr, texture, &tile_src, &tile_dst);
-		tile_c++;
-		}
+//	for (i = 0; i < 1; i++) {
+//		tile_dst.x = tile_pos;
+//		tile_dst.y = 11 * tile_c + 1;
+//		SDL_RenderCopy(sr, texture, &tile_src, &tile_dst);
+//		tile_c++;
+//		}
+display_grid();
 	return 0;
 }
 
@@ -395,7 +358,6 @@ int Ren_info(void) {
 	for (z = 0; z < 11; z++) {					// 11 lines of text
 		Ren_line(info, infol[z][0], infol[z][1], z * 11, 11, 0);
 	}
-
 	return 0;
 }