diff --git a/demo/mod/worldgen.fnl b/demo/mod/worldgen.fnl
index 914e29b..a99f0c3 100644
--- a/demo/mod/worldgen.fnl
+++ b/demo/mod/worldgen.fnl
@@ -185,6 +185,13 @@
 
       (pxl8.world_render world [cam-x eye-y cam-z])
 
+      (let [cx (/ (pxl8.get_width) 2)
+            cy (/ (pxl8.get_height) 2)
+            crosshair-size 4
+            red-color 18]
+        (pxl8.line (- cx crosshair-size) cy (+ cx crosshair-size) cy red-color)
+        (pxl8.line cx (- cy crosshair-size) cx (+ cy crosshair-size) red-color))
+
       (pxl8.text (.. "fps: " (string.format "%.1f" (pxl8.get_fps))) 5 5 12)
       (pxl8.text (.. "pos: " (string.format "%.0f" cam-x) ","
                      (string.format "%.0f" cam-y) ","