diff --git a/src/app/editor/graphics/gfx_group_editor.cc b/src/app/editor/graphics/gfx_group_editor.cc
index 52ec0993..45fa7bb4 100644
--- a/src/app/editor/graphics/gfx_group_editor.cc
+++ b/src/app/editor/graphics/gfx_group_editor.cc
@@ -228,6 +228,9 @@ void GfxGroupEditor::DrawSpritesetViewer(bool sheet_only) {
 
 namespace {
 void DrawPaletteFromPaletteGroup(gfx::SnesPalette &palette) {
+  if (palette.empty()) {
+    return;
+  }
   for (int n = 0; n < palette.size(); n++) {
     PushID(n);
     if ((n % 8) != 0) SameLine(0.0f, GetStyle().ItemSpacing.y);
diff --git a/src/app/editor/graphics/graphics_editor.cc b/src/app/editor/graphics/graphics_editor.cc
index 57e771c0..502774f8 100644
--- a/src/app/editor/graphics/graphics_editor.cc
+++ b/src/app/editor/graphics/graphics_editor.cc
@@ -183,7 +183,7 @@ void GraphicsEditor::DrawGfxEditToolset() {
     }
 
     TableNextColumn();
-    gui::InputHexByte("Tile Size", &tile_size_, 0x01);
+    gui::InputHexByte("Tile Size", &tile_size_);
 
     ImGui::EndTable();
   }
diff --git a/src/app/editor/overworld_editor.cc b/src/app/editor/overworld_editor.cc
index dc0ab822..ddb86260 100644
--- a/src/app/editor/overworld_editor.cc
+++ b/src/app/editor/overworld_editor.cc
@@ -43,6 +43,8 @@ using ImGui::TableNextRow;
 using ImGui::TableSetupColumn;
 using ImGui::Text;
 
+constexpr uint16_t kOverworldMapSize = 0x200;
+
 void OverworldEditor::InitializeZeml() {
   // Load zeml string from layouts/overworld.zeml
   std::string layout = gui::zeml::LoadFile("overworld.zeml");
@@ -461,8 +463,8 @@ void OverworldEditor::DrawOverworldMaps() {
   int yy = 0;
   for (int i = 0; i < 0x40; i++) {
     int world_index = i + (current_world_ * 0x40);
-    int map_x = (xx * 0x200 * ow_map_canvas_.global_scale());
-    int map_y = (yy * 0x200 * ow_map_canvas_.global_scale());
+    int map_x = (xx * kOverworldMapSize * ow_map_canvas_.global_scale());
+    int map_y = (yy * kOverworldMapSize * ow_map_canvas_.global_scale());
     ow_map_canvas_.DrawBitmap(maps_bmp_[world_index], map_x, map_y,
                               ow_map_canvas_.global_scale());
     xx++;
@@ -531,7 +533,8 @@ void OverworldEditor::RenderUpdatedMapBitmap(const ImVec2 &click_position,
   // Update the bitmap's pixel data based on the start_position and tile_data
   for (int y = 0; y < tile_size; ++y) {
     for (int x = 0; x < tile_size; ++x) {
-      int pixel_index = (start_position.y + y) * 0x200 + (start_position.x + x);
+      int pixel_index =
+          (start_position.y + y) * kOverworldMapSize + (start_position.x + x);
       current_bitmap.WriteToPixel(pixel_index, tile_data[y * tile_size + x]);
     }
   }
@@ -797,7 +800,8 @@ absl::Status OverworldEditor::DrawAreaGraphics() {
       palette_ = overworld_.AreaPalette();
       gfx::Bitmap bmp;
       RETURN_IF_ERROR(rom()->CreateAndRenderBitmap(
-          0x80, 0x200, 0x08, overworld_.current_graphics(), bmp, palette_));
+          0x80, kOverworldMapSize, 0x08, overworld_.current_graphics(), bmp,
+          palette_));
       current_graphics_set_[current_map_] = bmp;
     }
   }
@@ -1605,7 +1609,7 @@ absl::Status OverworldEditor::LoadGraphics() {
   palette_ = overworld_.AreaPalette();
 
   // Create the area graphics image
-  RETURN_IF_ERROR(rom()->CreateAndRenderBitmap(0x80, 0x200, 0x40,
+  RETURN_IF_ERROR(rom()->CreateAndRenderBitmap(0x80, kOverworldMapSize, 0x40,
                                                overworld_.current_graphics(),
                                                current_gfx_bmp_, palette_));
 
@@ -1650,7 +1654,8 @@ absl::Status OverworldEditor::LoadGraphics() {
     overworld_.set_current_map(i);
     auto palette = overworld_.AreaPalette();
     RETURN_IF_ERROR(rom()->CreateAndRenderBitmap(
-        0x200, 0x200, 0x200, overworld_.BitmapData(), maps_bmp_[i], palette));
+        kOverworldMapSize, kOverworldMapSize, 0x200, overworld_.BitmapData(),
+        maps_bmp_[i], palette));
   }
 
   if (flags()->overworld.kDrawOverworldSprites) {
@@ -1977,8 +1982,8 @@ absl::Status OverworldEditor::LoadAnimatedMaps() {
     RETURN_IF_ERROR(map.BuildBitmap(blockset));
 
     RETURN_IF_ERROR(rom()->CreateAndRenderBitmap(
-        0x200, 0x200, 0x200, map.bitmap_data(), animated_maps_[world_index],
-        *map.mutable_current_palette()));
+        kOverworldMapSize, kOverworldMapSize, 0x200, map.bitmap_data(),
+        animated_maps_[world_index], *map.mutable_current_palette()));
 
     animated_built[world_index] = true;
   }
diff --git a/src/app/gfx/snes_palette.h b/src/app/gfx/snes_palette.h
index e1992e13..bca6d6c1 100644
--- a/src/app/gfx/snes_palette.h
+++ b/src/app/gfx/snes_palette.h
@@ -137,6 +137,7 @@ class SnesPalette {
   }
 
   auto size() const { return colors.size(); }
+  auto empty() const { return colors.empty(); }
 
   SnesColor& operator[](int i) {
     if (i > size_) {
diff --git a/src/app/gui/asset_browser.h b/src/app/gui/asset_browser.h
index a4587493..a2038afc 100644
--- a/src/app/gui/asset_browser.h
+++ b/src/app/gui/asset_browser.h
@@ -503,7 +503,7 @@ struct GfxSheetAssetBrowser {
                     ImGui::GetColorU32(ImVec4(1, 1, 1, 1)));
                 draw_list->AddText(
                     ImVec2(box_min.x, box_max.y - ImGui::GetFontSize()),
-                    label_col, "ID");
+                    label_col, absl::StrFormat("%X", item_data->ID).c_str());
               }
             }
 
diff --git a/src/app/gui/input.cc b/src/app/gui/input.cc
index b46f4a6f..b10a65e7 100644
--- a/src/app/gui/input.cc
+++ b/src/app/gui/input.cc
@@ -47,9 +47,9 @@ bool InputScalarLeft(const char* label, ImGuiDataType data_type, void* p_data,
   //     value_changed = DataTypeApplyFromText(buf, data_type, p_data, format);
   // } else {
   const float button_size = GetFrameHeight();
-  ImGui::AlignTextToFramePadding();
-  ImGui::Text("%s", label);
-  ImGui::SameLine();
+  AlignTextToFramePadding();
+  Text("%s", label);
+  SameLine();
   BeginGroup();  // The only purpose of the group here is to allow the caller
                  // to query item data e.g. IsItemActive()
   PushID(label);
@@ -57,12 +57,12 @@ bool InputScalarLeft(const char* label, ImGuiDataType data_type, void* p_data,
       1.0f, CalcItemWidth() - (button_size + style.ItemInnerSpacing.x) * 2));
 
   // Place the label on the left of the input field
-  ImGui::PushStyleVar(ImGuiStyleVar_ItemSpacing,
-                      ImVec2{style.ItemSpacing.x, style.ItemSpacing.y});
-  ImGui::PushStyleVar(ImGuiStyleVar_FramePadding,
-                      ImVec2{style.FramePadding.x, style.FramePadding.y});
+  PushStyleVar(ImGuiStyleVar_ItemSpacing,
+               ImVec2{style.ItemSpacing.x, style.ItemSpacing.y});
+  PushStyleVar(ImGuiStyleVar_FramePadding,
+               ImVec2{style.FramePadding.x, style.FramePadding.y});
 
-  ImGui::SetNextItemWidth(input_width);
+  SetNextItemWidth(input_width);
   if (InputText("", buf, IM_ARRAYSIZE(buf),
                 flags))  // PushId(label) + "" gives us the expected ID
                          // from outside point of view
@@ -173,6 +173,19 @@ bool InputHexByte(const char* label, uint8_t* data, float input_width,
                                 ImGuiInputTextFlags_CharsHexadecimal, no_step);
 }
 
+bool InputHexByte(const char* label, uint8_t* data, uint8_t max_value,
+                  float input_width, bool no_step) {
+  if (ImGui::InputScalarLeft(label, ImGuiDataType_U8, data, &kStepOneHex,
+                             &kStepFastHex, "%02X", input_width,
+                             ImGuiInputTextFlags_CharsHexadecimal, no_step)) {
+    if (*data > max_value) {
+      *data = max_value;
+    }
+    return true;
+  }
+  return false;
+}
+
 void ItemLabel(absl::string_view title, ItemLabelFlags flags) {
   ImGuiWindow* window = ImGui::GetCurrentWindow();
   const ImVec2 lineStart = ImGui::GetCursorScreenPos();
diff --git a/src/app/gui/input.h b/src/app/gui/input.h
index 6e1adeaa..08a059e1 100644
--- a/src/app/gui/input.h
+++ b/src/app/gui/input.h
@@ -31,6 +31,9 @@ IMGUI_API bool InputHexWord(const char* label, int16_t* data,
 IMGUI_API bool InputHexByte(const char* label, uint8_t* data,
                             float input_width = 50.f, bool no_step = false);
 
+IMGUI_API bool InputHexByte(const char* label, uint8_t* data, uint8_t max_value,
+                            float input_width = 50.f, bool no_step = false);
+
 IMGUI_API bool ListBox(const char* label, int* current_item,
                        const std::vector<std::string>& items,
                        int height_in_items = -1);