diff --git a/lisp/play/gamegrid.el b/lisp/play/gamegrid.el
index 8cff67c5bcc..4e4982e7b0d 100644
--- a/lisp/play/gamegrid.el
+++ b/lisp/play/gamegrid.el
@@ -80,12 +80,8 @@ directory will be used.")
 (defun gamegrid-calculate-glyph-size ()
   "Calculate appropriate glyph size in pixels based on display resolution.
 Return a multiple of 8 no less than 16."
-  (let (atts
+  (let ((atts (frame-monitor-attributes))
         y-pitch)
-    (dolist (mon (display-monitor-attributes-list))
-      (when-let ((frames (alist-get 'frames mon))
-                 (match (memq (selected-frame) frames)))
-        (setq atts mon)))
     (setq y-pitch (cond
                    (atts
                     (/ (nth 4 (assq 'geometry atts))