commit - 051431c4e9b8488f906aa8b8cb3678e2b77b5816
commit + 2e032d404070bcc82a37fed6665426f1846bce43
blob - 32915f8c0967c763bc933458a6506bb68b5114fe
blob + 71906cc9bb1ebd91dab69e980ce8e4e78bf08bf7
--- tetris.6
+++ tetris.6
@@ -80,6 +80,9 @@ By default, shapes are displayed colorfully if the use
 The
 .Fl b
 option can be used to restore the traditional black-and-white behavior.
+.It Fl f
+By default, the fallrate is staying constant.
+With this option, the fallrate increases over time.
 .It Fl k
 The default control keys can be changed using the
 .Fl k
blob - fee0535bfb821ec42575c8fd6fe686d93f9c2f06
blob + 2a002e3a1dd99814ffc2607abb11c2d3918b2c9d
--- tetris.c
+++ tetris.c
@@ -75,6 +75,7 @@ gid_t	gid, egid;
 char	key_msg[100];
 int	showpreview;
 int	nocolor;
+int	dofaster;
 
 static void elide(void);
 static void setup_board(void);
@@ -150,11 +151,14 @@ main(int argc, char *argv[])
 
 	keys = "jkl pqn";
 
-	while ((ch = getopt(argc, argv, "bk:l:ps")) != -1)
+	while ((ch = getopt(argc, argv, "bfk:l:ps")) != -1)
 		switch(ch) {
 		case 'b':
 			nocolor = 1;
 			break;
+		case 'f':
+			dofaster = 1;
+			break;
 		case 'k':
 			if (strlen(keys = optarg) != NUMKEYS)
 				usage();
blob - 8e1479f198ca603125efb9302fa1a323c2fec7af
blob + d00f79db4bbe1a8f0f3d8c15a8574716e38048a4
--- tetris.h
+++ tetris.h
@@ -145,7 +145,8 @@ extern const struct shape *nextshape;
  * but by then the game is utterly impossible.
  */
 extern long	fallrate;	/* less than 1 million; smaller => faster */
-#define	faster() (fallrate -= fallrate / 3000)
+extern int	dofaster;	/* if 1, accelerate shapes */
+#define	faster() (dofaster ? (fallrate -= fallrate / 3000) : fallrate)
 
 /*
  * Game level must be between 1 and 9.  This controls the initial fall rate