diff --git a/assets/songs/json/mary.json b/assets/songs/json/mary.json
index bf07e33..e30839b 100644
--- a/assets/songs/json/mary.json
+++ b/assets/songs/json/mary.json
@@ -55,6 +55,9 @@
       },
       "name": "Melody 2",
       "notes": [
+        {"duration": 0.5, "durationTicks": 480, "midi": 64, "name": "E4", "ticks": 0, "time": 0, "velocity": 0.7874015748031497},
+        {"duration": 0.5, "durationTicks": 480, "midi": 62, "name": "D4", "ticks": 480, "time": 0.5, "velocity": 0.7874015748031497},
+        {"duration": 0.5, "durationTicks": 480, "midi": 60, "name": "C4", "ticks": 960, "time": 1, "velocity": 0.7874015748031497},
         {"duration": 0.5, "durationTicks": 480, "midi": 62, "name": "D4", "ticks": 1440, "time": 1.5, "velocity": 0.7874015748031497},
         {"duration": 0.5, "durationTicks": 480, "midi": 64, "name": "E4", "ticks": 1920, "time": 2, "velocity": 0.7874015748031497},
         {"duration": 0.5, "durationTicks": 480, "midi": 64, "name": "E4", "ticks": 2400, "time": 2.5, "velocity": 0.7874015748031497},
@@ -75,6 +78,8 @@
       },
       "name": "Melody 3",
       "notes": [
+        {"duration": 0.5, "durationTicks": 480, "midi": 62, "name": "D4", "ticks": 480, "time": 0.5, "velocity": 0.7874015748031497},
+        {"duration": 0.5, "durationTicks": 480, "midi": 60, "name": "C4", "ticks": 960, "time": 1, "velocity": 0.7874015748031497},
         {"duration": 0.5, "durationTicks": 480, "midi": 62, "name": "D4", "ticks": 3840, "time": 4, "velocity": 0.7874015748031497},
         {"duration": 0.5, "durationTicks": 480, "midi": 62, "name": "D4", "ticks": 4320, "time": 4.5, "velocity": 0.7874015748031497},
         {"duration": 1, "durationTicks": 960, "midi": 62, "name": "D4", "ticks": 4800, "time": 5, "velocity": 0.7874015748031497}
@@ -94,6 +99,7 @@
       },
       "name": "Melody 4",
       "notes": [
+        {"duration": 0.5, "durationTicks": 480, "midi": 60, "name": "C4", "ticks": 960, "time": 1, "velocity": 0.7874015748031497},
         {"duration": 0.5, "durationTicks": 480, "midi": 64, "name": "E4", "ticks": 5760, "time": 6, "velocity": 0.7874015748031497},
         {"duration": 0.5, "durationTicks": 480, "midi": 67, "name": "G4", "ticks": 6240, "time": 6.5, "velocity": 0.7874015748031497},
         {"duration": 1, "durationTicks": 960, "midi": 67, "name": "G4", "ticks": 6720, "time": 7, "velocity": 0.7874015748031497}
diff --git a/src/samples/ghhb_game.h b/src/samples/ghhb_game.h
index dd99116..c0420d8 100644
--- a/src/samples/ghhb_game.h
+++ b/src/samples/ghhb_game.h
@@ -18,6 +18,7 @@ constexpr int MAX_GAMEPADS = 4;
 constexpr int MAX_INSTRUMENT_TYPES = MAX_GAMEPADS;
 constexpr float RECEPTOR_HEIGHT = 150.0f;
 constexpr float HIT_ZONE_MARGIN = 20.0f;
+constexpr float SIMULTANEOUS_NOTE_Y_TOLERANCE = 2.0f;
 constexpr float SCROLL_PX_PER_SEC = 350.0f;
 constexpr float LEAD_OFFSET_SECONDS = 3.0f;
 
@@ -500,6 +501,10 @@ public:
                 {
                     continue;
                 }
+                if (!lane_pressed_by_instrument_owner(lane, n->instrument_slot))
+                {
+                    continue;
+                }
                 float y = glyph_y(*n);
                 float d = fabsf(y - hit_line_y);
                 if (d < best_dist)
@@ -510,12 +515,9 @@ public:
             }
             if (best != nullptr)
             {
-                if (lane_pressed_by_instrument_owner(lane, best->instrument_slot))
-                {
-                    consume_note(best);
-                }
+                consume_note(best);
             }
-            else if (is_lane_pressed(lane))
+            else
             {
                 combo = 0;
                 score = std::max(0, score - 25);
@@ -595,6 +597,7 @@ public:
                        button_label_font_size, 1, Color{220, 220, 240, 255});
         }
 
+        std::vector<std::vector<Glyph*>> by_lane(static_cast<size_t>(LANE_COUNT));
         for (Glyph* n : spawned)
         {
             float y = glyph_y(*n);
@@ -602,13 +605,45 @@ public:
             {
                 continue;
             }
-            float cx = lane_center_x(n->lane);
-            Color fill = INSTRUMENT_COLORS[n->instrument_slot];
-            Color edge = Color{static_cast<unsigned char>(std::min(255, fill.r + 35)),
-                              static_cast<unsigned char>(std::min(255, fill.g + 50)),
-                              static_cast<unsigned char>(std::min(255, fill.b + 50)), 255};
-            DrawCircle(static_cast<int>(cx), static_cast<int>(y), 22, fill);
-            DrawCircleLines(static_cast<int>(cx), static_cast<int>(y), 22, edge);
+            by_lane[static_cast<size_t>(n->lane)].push_back(n);
+        }
+        for (int lane = 0; lane < LANE_COUNT; lane++)
+        {
+            std::vector<Glyph*>& list = by_lane[static_cast<size_t>(lane)];
+            std::sort(list.begin(), list.end(),
+                     [this](Glyph* a, Glyph* b) { return glyph_y(*a) < glyph_y(*b); });
+            float left_base = lane * lane_width;
+            for (size_t i = 0; i < list.size();)
+            {
+                size_t j = i;
+                float y0 = glyph_y(*list[i]);
+                while (j < list.size() &&
+                       glyph_y(*list[j]) - y0 <= SIMULTANEOUS_NOTE_Y_TOLERANCE)
+                {
+                    j++;
+                }
+                int group_count = static_cast<int>(j - i);
+                float slice_width = lane_width / static_cast<float>(group_count);
+                float glyph_height = lane_width / 2.0f;
+                for (int k = 0; k < group_count; k++)
+                {
+                    Glyph* n = list[i + static_cast<size_t>(k)];
+                    float y = glyph_y(*n);
+                    float left = left_base + k * slice_width;
+                    float top = y - glyph_height / 2.0f;
+                    Color fill = INSTRUMENT_COLORS[n->instrument_slot];
+                    Color edge = Color{
+                        static_cast<unsigned char>(std::min(255, fill.r + 35)),
+                        static_cast<unsigned char>(std::min(255, fill.g + 50)),
+                        static_cast<unsigned char>(std::min(255, fill.b + 50)), 255};
+                    DrawRectangle(static_cast<int>(left), static_cast<int>(top),
+                                  static_cast<int>(slice_width),
+                                  static_cast<int>(glyph_height), fill);
+                    DrawRectangleLinesEx(
+                        Rectangle{left, top, slice_width, glyph_height}, 2.0f, edge);
+                }
+                i = j;
+            }
         }
 
         std::string score_text = "Score: " + std::to_string(score) + "   Combo: " + std::to_string(combo);