diff --git a/README.md b/README.md
index aef7c00..3cb1ca0 100644
--- a/README.md
+++ b/README.md
@@ -8,8 +8,7 @@ The subject is available here: [Test Algo](./test_algo.pdf)
 - [ ] skyline
 - [X] add raygui
 - [X] resize box
-- [ ] add box in gui by pressing down
-- [ ] delete box in gui by clicking
+- [X] delete box in gui by clicking
 - [ ] wrap stb_rect_pack?
 - [X] change bbox api to origin + size
 - [ ] dummy A2
diff --git a/src/main_gui.cpp b/src/main_gui.cpp
index 2409ddc..e218a30 100644
--- a/src/main_gui.cpp
+++ b/src/main_gui.cpp
@@ -119,8 +119,10 @@ int main(int argc, const char* argv[]) {
     const Vector2 b_size = {150, 30};
     Vector2 mouse_pos = {0};
     Vector2 mouse_delta = {0};
-    int b_moving_idx = -1;
-    int b_resize_idx = -1;
+    constexpr int idx_unset = -1;
+    int b_moving_idx = idx_unset;
+    int b_resize_idx = idx_unset;
+    int b_delete_idx = idx_unset;
 
     while (!WindowShouldClose()) {
         //
@@ -131,8 +133,10 @@ int main(int argc, const char* argv[]) {
         for (int b = 0, size = bboxes.size(); b < size; ++b) {
             const auto& box = bboxes[b];
             const Rectangle rect = rect_from_bbox(box, in_offset);
-            if (CheckCollisionPointRec(mouse_pos, rect) and
-                IsMouseButtonPressed(MOUSE_BUTTON_LEFT)) {
+            if (not CheckCollisionPointRec(mouse_pos, rect)) {
+                continue;
+            }
+            if (IsMouseButtonPressed(MOUSE_BUTTON_LEFT)) {
                 const Rectangle handle_area = {
                     rect.x + rect.width - resize_handle,
                     rect.y + rect.height - resize_handle, resize_handle,
@@ -143,23 +147,30 @@ int main(int argc, const char* argv[]) {
                     b_moving_idx = b;
                 }
             }
+            if (IsMouseButtonPressed(MOUSE_BUTTON_RIGHT)) {
+                b_delete_idx = b;
+            }
         }
         if (IsMouseButtonReleased(MOUSE_BUTTON_LEFT)) {
-            b_moving_idx = -1;
-            b_resize_idx = -1;
+            b_moving_idx = idx_unset;
+            b_resize_idx = idx_unset;
         }
-        if (b_moving_idx != -1) {
+        if (b_moving_idx != idx_unset) {
             auto& box = bboxes[b_moving_idx];
             box.x += mouse_delta.x;
             box.y += mouse_delta.y;
         }
-        if (b_resize_idx != -1) {
+        if (b_resize_idx != idx_unset) {
             auto& box = bboxes[b_resize_idx];
             box.width = std::max(static_cast<int>(box.width + mouse_delta.x),
                                  resize_handle);
             box.height = std::max(static_cast<int>(box.height + mouse_delta.y),
                                   resize_handle);
         }
+        if (b_delete_idx != idx_unset) {
+            bboxes.erase(bboxes.begin() + b_delete_idx);
+            b_delete_idx = idx_unset;
+        }
 
         //
         // Draw
diff --git a/src/pack.cpp b/src/pack.cpp
index ea39870..9b922ea 100644
--- a/src/pack.cpp
+++ b/src/pack.cpp
@@ -57,18 +57,17 @@ std::optional<Frame> pack(const Frame& in_frame,
     int max_area = 0;
     for (const auto& box : sorted_bboxes) {
         int area = box.area();
-        std::cout << "bounding box area: " << area << "\n";
         max_area += area;
     }
-    std::cout << "max area: " << max_area << "\n";
+    std::cout << "[pack] max area: " << max_area << "\n";
     int optimal_size = int(ceil(std::sqrt(max_area)));
-    std::cout << "optimal image dimention: " << optimal_size << " x "
+    std::cout << "[pack] optimal image dimention: " << optimal_size << " x "
               << optimal_size << "\n";
 
     // cf. subject: D < min(M, N )
     const int max_size = std::min(in_frame.width, in_frame.height) - 1;
-    std::cout << "maximum image dimention: " << max_size << " x " << max_size
-              << "\n";
+    std::cout << "[pack] maximum image dimention: " << max_size << " x "
+              << max_size << "\n";
 
     // We will try to fit all the rectangles in a given square of size S.
     // optimal_size <= S <= max_size (smallest dimension of input frame)
@@ -76,6 +75,8 @@ std::optional<Frame> pack(const Frame& in_frame,
     const int nb_candidates = 5;
     const int size_increment = (max_size - optimal_size) / nb_candidates;
     for (int size = optimal_size; size <= max_size; size += size_increment) {
+        std::cout << "[pack] trying to fit in " << size << " x " << size
+                  << "\n";
         int x = 0;
         int y = 0;
         int next_row = 0;
@@ -84,16 +85,23 @@ std::optional<Frame> pack(const Frame& in_frame,
         for (int box_i = 0, box_max = bboxes.size();
              room_left and box_i < box_max; ++box_i) {
             auto& box = sorted_bboxes[box_i];
+            std::cout << "[pack]  box " << box.width << " x " << box.height
+                      << "\n";
 
             // If we don't have room in either dimension, we won't be able to
             // pack within this size candidate.
-            if (x + box.width >= size or y + box.height >= size) {
+            if (x + box.width >= size and next_row + box.height >= size) {
+                std::cout << "[pack]   -> no room left (last row height = "
+                          << size - y << ")\n";
                 room_left = false;
                 continue;
             }
 
             // If we cannot fit the rect on the right, we fit it below.
             if (x + box.width >= size) {
+                std::cout
+                    << "[pack]   -> cannot fit in current row (width left = "
+                    << size - x << ")\n";
                 x = 0;
                 y = next_row;
             }
@@ -103,11 +111,13 @@ std::optional<Frame> pack(const Frame& in_frame,
             // know the next ones won't cross this line.
             if (x == 0) {
                 next_row = box.height;
+                std::cout << "[pack]   -> create new row at line " << y << "\n";
             }
 
             box.x = x;
             box.y = y;
             x += box.width;
+            std::cout << "[pack]   -> fit in (" << x << ", " << y << ")\n";
         }
 
         if (room_left) {