diff --git a/client/src/main.c b/client/src/main.c
index 6e138a2..e9675db 100644
--- a/client/src/main.c
+++ b/client/src/main.c
@@ -508,6 +508,43 @@ void key_callback(GLFWwindow* window, int key, int scancode, int action, int mod
       update_region_info_ui(context);
     }
     break;
+
+  case GLFW_KEY_Y:
+    if(action == GLFW_PRESS) {
+      HexRegion* region = context->hex->regions[context->hex->data.clicked_region];
+      if(region != NULL) {
+        region->data.hexes[context->hex->data.clicked_hex].height[context->hex->data.clicked_vertex-1] += 0.1; 
+        add_transfer(
+            &region->data.hexes[context->hex->data.clicked_hex].height[context->hex->data.clicked_vertex-1],
+            region->region,
+            offsetof(GPUHexRegion, hexes)
+            + sizeof(GPUHex)*context->hex->data.clicked_hex
+            + offsetof(GPUHex, height)
+            + sizeof(float)*(context->hex->data.clicked_vertex-1),
+            sizeof(float),
+            context->render->current_frame,
+            context->render);
+      }
+    }
+    break;
+  case GLFW_KEY_H:
+    if(action == GLFW_PRESS) {
+      HexRegion* region = context->hex->regions[context->hex->data.clicked_region];
+      if(region != NULL) {
+        region->data.hexes[context->hex->data.clicked_hex].height[context->hex->data.clicked_vertex-1] -= 0.1; 
+        add_transfer(
+            &region->data.hexes[context->hex->data.clicked_hex].height[context->hex->data.clicked_vertex-1],
+            region->region,
+            offsetof(GPUHexRegion, hexes)
+            + sizeof(GPUHex)*context->hex->data.clicked_hex
+            + offsetof(GPUHex, height)
+            + sizeof(float)*(context->hex->data.clicked_vertex-1),
+            sizeof(float),
+            context->render->current_frame,
+            context->render);
+      }
+    }
+    break;
   }
 }