diff --git a/Makefile b/Makefile
index 4384648..08c53ac 100644
--- a/Makefile
+++ b/Makefile
@@ -21,6 +21,9 @@ endif
 build:
 	meson compile -j 10 -C $(ROOT_DIR)/builddir
 
+asset_build: build
+	./builddir/icongen
+
 release_build:
 	meson --wipe builddir -Db_ndebug=true --buildtype release
 	meson compile -j 10 -C builddir
@@ -33,7 +36,7 @@ tracy_build:
 	meson setup --wipe builddir --buildtype debugoptimized -Dtracy_enable=true -Dtracy:on_demand=true
 	meson compile -j 10 -C builddir
 
-test: build
+test: asset_build build
 	./builddir/runtests "[map-sprite]"
 
 run: build test
diff --git a/assets/map_tiles.png b/assets/map_tiles.png
index b024baa..aec7e89 100644
Binary files a/assets/map_tiles.png and b/assets/map_tiles.png differ
diff --git a/tests/map.cpp b/tests/map.cpp
index 436924b..5ebb1e2 100644
--- a/tests/map.cpp
+++ b/tests/map.cpp
@@ -99,6 +99,8 @@ TEST_CASE("map image test", "[map-sprite]") {
 
   for(auto tile : tiles) {
     sf::Vector2i coords{tile["x"], tile["y"]};
+    REQUIRE(coords.x % size.x == 0);
+    REQUIRE(coords.y % size.y == 0);
     sprite_coord.insert_or_assign(tile["display"], coords);
   }
 
@@ -117,13 +119,24 @@ TEST_CASE("map image test", "[map-sprite]") {
     REQUIRE(sprite_coord.contains(display));
 
     auto coords = sprite_coord.at(display);
-    sf::IntRect square{coords, size};
+    sf::IntRect square{coords, {size.x, size.y}};
     sf::Sprite sprite{map_sprites, square};
     sprite.setColor({150,150,150,255});
-    sprite.setPosition({float(it.x) * float(size.x), float(it.y) * float(size.y)});
+    sprite.setPosition({float(it.x * size.x), float(it.y * size.y)});
     render.draw(sprite);
   }
 
+
+  level.world->query<components::Position, components::Tile>([&](auto, auto &pos, auto &entity_glyph) {
+    REQUIRE(sprite_coord.contains(entity_glyph.display));
+    auto coords = sprite_coord.at(entity_glyph.display);
+    sf::IntRect square{coords, {size.x, size.y}};
+    sf::Sprite sprite{map_sprites, square};
+    sprite.setColor({255,150,150,255});
+    sprite.setPosition({float(pos.location.x * size.x), float(pos.location.y * size.y)});
+    render.draw(sprite);
+  });
+
   render.display();
   sf::Image out_img = render.getTexture().copyToImage();
   bool worked = out_img.saveToFile("map_test.png");
diff --git a/tools/icongen.cpp b/tools/icongen.cpp
index aaf2ca5..a06bb7a 100644
--- a/tools/icongen.cpp
+++ b/tools/icongen.cpp
@@ -33,26 +33,28 @@ struct MapTileBuilder {
   sf::Glyph $glyph;
   sf::Font $font{FONT_FILE_NAME};
   std::shared_ptr<sf::RenderTexture> $render = nullptr;
-  sf::Vector2u $size;
-  sf::Vector2u $image_size;
+  sf::Vector2i $size;
+  sf::Vector2i $image_size;
   sf::RenderTexture $temp_render;
 
   MapTileBuilder(size_t x, size_t y) :
     $size(x, y),
     $image_size($size.x * TILE_COUNT, $size.y * TILE_COUNT),
-    $temp_render($size)
+    $temp_render({(unsigned int)$size.x, (unsigned int)$size.y})
   {
     $font.setSmooth(false);
   }
 
-  void best_size(wchar_t for_char) {
+  void best_size(wchar_t for_char, bool centered) {
+    float factor = centered ? 0.8f : 1.0f;
+    sf::Vector2i adjusted_size = {int($size.x * factor), int($size.y * factor)};
     $font_size = 20; // reset the size
     // fit the glyph in our box height
     auto temp = $font.getGlyph(for_char, $font_size, false);
     auto temp_size = $font_size;
 
-    while(temp.textureRect.size.y < int($size.y)
-        && temp.textureRect.size.x < int($size.x))
+    while(temp.textureRect.size.y <= adjusted_size.y
+        && temp.textureRect.size.x <= adjusted_size.x)
     {
       $glyph = temp;
       $font_size = temp_size;
@@ -79,6 +81,7 @@ struct MapTileBuilder {
   void run(MapConfig& config) {
     sf::Vector2u crop{$size.x * (unsigned int)config.it.width, $size.y * (unsigned int)config.it.y};
     $render = std::make_shared<sf::RenderTexture>(crop);
+    $render->clear({0,0,0,0});
 
     $render->setSmooth(false);
     sf::Vector2f cell_pos{0.0f,0.0f};
@@ -93,7 +96,7 @@ struct MapTileBuilder {
       wchar_t display_char = config.map[it.y][it.x];
       std::wstring content{display_char};
 
-      best_size(display_char);
+      best_size(display_char, is_centered);
 
       sf::Text icon{$font, content, $font_size};
       icon.setFillColor({0, 0, 0, 255});
@@ -105,16 +108,15 @@ struct MapTileBuilder {
       sf::Sprite sprite{font_texture, $glyph.textureRect};
       auto t_size = $glyph.textureRect.size;
 
-      dbc::check(int($size.x - t_size.x) > 0, "font too big on x");
-      dbc::check(int($size.y - t_size.y) > 0, "font too big on y");
+      dbc::check($size.x - t_size.x >= 0, "font too big on x");
+      dbc::check($size.y - t_size.y >= 0, "font too big on y");
 
       if(is_centered) {
         sf::Vector2f center{
-          (float($size.x) - float(t_size.x)) / 2.0f,
-          (float($size.y) - float(t_size.y)) / 2.0f};
+          float(($size.x - t_size.x) / 2),
+          float(($size.y - t_size.y) / 2)};
 
-        sf::Vector2f scale{float($size.x) / float(t_size.x) * 0.8f, float($size.y) / float(t_size.y) * 0.8f};
-        sprite.setScale(scale);
+        sprite.setScale({1.0f, 1.0f});
         sprite.setPosition({cell_pos.x + center.x, cell_pos.y + center.y});
       } else {
         sf::Vector2f scale{float($size.x) / float(t_size.x), float($size.y) / float(t_size.y)};