diff -Naur tetrinet-0.11/tty.c tetrinet-0.11.patched/tty.c
--- tetrinet-0.11/tty.c	2003-09-11 16:26:53.000000000 -0400
+++ tetrinet-0.11.patched/tty.c	2020-11-21 00:53:04.798758121 -0500
@@ -237,6 +237,15 @@
     if ((has_color = has_colors()))
 	start_color();
     getmaxyx(stdscr, scrheight, scrwidth);
+
+	 if(scrheight < 50 || scrwidth < 80) {
+		 screen_cleanup();
+		 fprintf(stderr,
+				 "Terminal size %dx%d is too small. Minimum is 80x50.\n",
+				 scrwidth, scrheight);
+		 exit(-1);
+	 }
+
     scrwidth--;  /* Don't draw in last column--this can cause scroll */
 
     /* Cancel all this when we exit. */