diff --git a/c/gtk3/bombs/bombs.c b/c/gtk3/bombs/bombs.c
new file mode 100644
index 0000000..d103c7c
--- /dev/null
+++ b/c/gtk3/bombs/bombs.c
@@ -0,0 +1,134 @@
+#include <math.h>
+#include <gtk/gtk.h>
+
+
+const double pi = 3.141592653589793;
+
+GtkWidget *window;
+cairo_surface_t *surface;
+cairo_t *context;
+
+gboolean dropping = FALSE;
+double x = 0.0;
+double y = 0.0;
+double r = 0.0;
+double speed = 0.0;
+double mouse_x = 0.0;
+double mouse_y = 0.0;
+
+
+gboolean timeout(gpointer data) {
+  if (dropping) {
+    y += speed;
+    r += 1.0;
+    speed += 1.0;
+    
+    int iy = (int)y;
+    int ix = (int)x;
+    if ( ix < 0 || ix >= cairo_image_surface_get_width(surface)
+      || iy < 0 || iy >= cairo_image_surface_get_height(surface) )
+    {
+      dropping = FALSE;
+    } else {
+      unsigned char *pixels = cairo_image_surface_get_data(surface);
+      int stright = cairo_image_surface_get_stride(surface);
+      unsigned char *pixel = pixels + iy*stright + ix*4;
+      if (pixel[3] > 0) { // alpha channel
+        dropping = FALSE;
+        cairo_save(context);
+        cairo_set_operator(context, CAIRO_OPERATOR_CLEAR);
+        cairo_arc(context, x, y, r, 0, 2*pi);
+        cairo_fill(context);
+        cairo_restore(context);
+        cairo_surface_flush(surface);
+      }
+    }
+    gtk_widget_queue_draw(window);
+  }
+  return TRUE;
+}
+
+gboolean motion(GtkWidget *widget, GdkEventMotion *event, gpointer data) {
+  if (event->state & GDK_BUTTON1_MASK) {
+    cairo_save(context);
+    cairo_set_line_cap(context, CAIRO_LINE_CAP_ROUND);
+    cairo_set_line_width(context, 50);
+    cairo_set_source_rgba(context, 0, 0, 0, 1);
+    cairo_move_to(context, mouse_x, mouse_y);
+    cairo_line_to(context, event->x, event->y);
+    cairo_stroke(context);
+    cairo_restore(context);
+    cairo_surface_flush(surface);
+    gtk_widget_queue_draw(window);
+  }
+  mouse_x = event->x;
+  mouse_y = event->y;
+  return TRUE;
+}
+
+gboolean button_press(GtkWidget *widget, GdkEventButton *event, gpointer data) {
+  if (event->button == 2) {
+    cairo_save(context);
+    cairo_set_operator(context, CAIRO_OPERATOR_CLEAR);
+    cairo_paint(context);
+    cairo_restore(context);
+    cairo_surface_flush(surface);
+    gtk_widget_queue_draw(window);
+  } else
+  if (event->button == 3) {
+    x = event->x;
+    y = event->y;
+    r = 0;
+    speed = 0;
+    dropping = TRUE;
+    gtk_widget_queue_draw(window);
+  }
+  return TRUE;
+}
+
+gboolean draw(GtkWidget *widget, cairo_t *cr, gpointer data) {
+  cairo_set_source_rgba(cr, 0.9, 0.9, 0.9, 1);
+  cairo_paint(cr);
+
+  cairo_set_source_surface(cr, surface, 0, 0);
+  cairo_paint(cr);
+  if (dropping) {
+    cairo_set_line_width(cr, 1);
+    cairo_arc(cr, x, y, r, 0, 2*pi);
+    cairo_set_source_rgba(cr, 1, 1, 1, 1);
+    cairo_fill_preserve(cr);
+    cairo_set_source_rgba(cr, 0, 0, 0, 1);
+    cairo_stroke(cr);
+  }
+  return TRUE;
+}
+
+void activate(GtkApplication* app, gpointer data) {
+  window = gtk_application_window_new (app);
+  g_signal_connect(window, "draw", G_CALLBACK(draw), NULL);
+  g_signal_connect(window, "motion-notify-event", G_CALLBACK(motion), NULL);
+  g_signal_connect(window, "button-press-event", G_CALLBACK(button_press), NULL);
+  gtk_widget_add_events(window, GDK_POINTER_MOTION_MASK | GDK_BUTTON_PRESS_MASK);
+  gtk_window_set_default_size(
+    GTK_WINDOW(window),
+    cairo_image_surface_get_width(surface),
+    cairo_image_surface_get_height(surface) );
+  gtk_widget_show_all(window);
+
+  g_timeout_add(10, timeout, NULL);
+}
+
+int main(int argc, char **argv) {
+  surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, 700, 500);
+  context = cairo_create(surface);
+
+  GtkApplication *application = gtk_application_new(NULL, 0);
+  g_signal_connect(application, "activate", G_CALLBACK(activate), NULL);
+  int status = g_application_run(G_APPLICATION(application), argc, argv);
+  g_object_unref(application);
+
+  cairo_destroy(context);
+  cairo_surface_destroy(surface);
+  return status;
+}
+