diff --git a/source/core.adb b/source/core.adb
index 29066e9..0336b62 100644
--- a/source/core.adb
+++ b/source/core.adb
@@ -281,19 +281,18 @@ package body core is
 		for step in 0 .. repeat.y
 		loop
 			if step mod 2 = 1 then
-				for next in 0 .. repeat.x
+				for next in 0 .. repeat.x - 1
 				loop
 					line ((x + offset.x + base / 2 + next * base, y + offset.y + step * base + base / 4), (-base / 2, -base / 2));
 					line ((x + offset.x + base / 2 + next * base, y + offset.y + step * base + base / 4), ( base / 2, -base / 2));
 				end loop;
 			else
-				for next in 0 .. repeat.x
+				for next in 0 .. repeat.x - 1
 				loop
-					line ((x + offset.x + base + next * base, y + offset.y + step * base + base / 4), (-base / 2, -base / 2));
-					line ((x + offset.x + base + next * base, y + offset.y + step * base + base / 4), ( base / 2, -base / 2));
+					line ((x + offset.x + base / 2 + next * base, y + offset.y + step * base - base / 4), (-base / 2, base / 2));
+					line ((x + offset.x + base / 2 + next * base, y + offset.y + step * base - base / 4), ( base / 2, base / 2));
 				end loop;
 			end if;
-			--~line ((x + offset.x + 3 * base / 2, y + offset.y + next * base + base / 4), (-base / 2, -base / 2));
 		end loop;
 		--
 		if repeat.y mod 4 = 1 then
diff --git a/source/main.adb b/source/main.adb
index f1e66f4..bd6ea09 100644
--- a/source/main.adb
+++ b/source/main.adb
@@ -98,7 +98,7 @@ begin
 		--~end loop;
 		--
 		core.draw_central_grid (preview_x, preview_y, preview_width - 2 * preview_x, preview_height - 2 * preview_y);
-		--~core.draw_squared_grid (preview_x, preview_y, preview_width - 2 * preview_x, preview_height - 2 * preview_y);
+		core.draw_squared_grid (preview_x, preview_y, preview_width - 2 * preview_x, preview_height - 2 * preview_y);
 		core.draw_hexagon_grid (preview_x, preview_y, preview_width - 2 * preview_x, preview_height - 2 * preview_y);
 		--
 		--~ui.draw_menu      (0,             0, preview_width, preview_height, false);