diff -xconfig.h -xunixconf.h -x'Makefile*' -x'*.o' -ru nethack-3.4.3_orig/include/extern.h nethack-3.4.3/include/extern.h
--- nethack-3.4.3_orig/include/extern.h	2003-12-07 18:39:13.000000000 -0500
+++ nethack-3.4.3/include/extern.h	2005-05-26 20:50:15.986802792 -0400
@@ -1939,7 +1939,7 @@
 E void NDECL(level_tele);
 E void FDECL(domagicportal, (struct trap *));
 E void FDECL(tele_trap, (struct trap *));
-E void FDECL(level_tele_trap, (struct trap *));
+E int FDECL(level_tele_trap, (struct trap *, BOOLEAN_P));
 E void FDECL(rloc_to, (struct monst *,int,int));
 E boolean FDECL(rloc, (struct monst *, BOOLEAN_P));
 E boolean FDECL(tele_restrict, (struct monst *));
diff -xconfig.h -xunixconf.h -x'Makefile*' -x'*.o' -ru nethack-3.4.3_orig/src/teleport.c nethack-3.4.3/src/teleport.c
--- nethack-3.4.3_orig/src/teleport.c	2003-12-07 18:39:13.000000000 -0500
+++ nethack-3.4.3/src/teleport.c	2005-05-26 21:39:32.200390016 -0400
@@ -458,6 +458,11 @@
 	struct trap *trap;
 
 	trap = t_at(u.ux, u.uy);
+
+	if (trap && trap->tseen && trap->ttyp == LEVEL_TELEP &&
+	    yn("There is a level teleporter here.  Jump in?") == 'y')
+		return level_tele_trap(trap, TRUE);
+
 	if (trap && (!trap->tseen || trap->ttyp != TELEP_TRAP))
 		trap = 0;
 
@@ -855,19 +860,30 @@
 		tele();
 }
 
-void
-level_tele_trap(trap)
+int
+level_tele_trap(trap, jumped)
 struct trap *trap;
+boolean jumped;
 {
-	You("%s onto a level teleport trap!",
+	/*
+	 * The message here calls it a "level teleport trap", but in
+	 * other places it's called a "level teleporter" ('There is a
+	 * level teleporter here.').  This is also the string to wish
+	 * for to generate one in wizmode.
+	 */
+	if (jumped)
+		You("%s onto the level teleporter.",
+			    locomotion(youmonst.data, "jump"));
+	else
+		You("%s onto a level teleport trap!",
 		      Levitation ? (const char *)"float" :
 				  locomotion(youmonst.data, "step"));
-	if (Antimagic) {
+	if (!jumped && Antimagic) {
 	    shieldeff(u.ux, u.uy);
 	}
-	if (Antimagic || In_endgame(&u.uz)) {
+	if ((!jumped && Antimagic) || In_endgame(&u.uz)) {
 	    You_feel("a wrenching sensation.");
-	    return;
+	    return(0);
 	}
 	if (!Blind)
 	    You("are momentarily blinded by a flash of light.");
@@ -876,6 +892,7 @@
 	deltrap(trap);
 	newsym(u.ux,u.uy);	/* get rid of trap symbol */
 	level_tele();
+	return(1);
 }
 
 /* check whether monster can arrive at location <x,y> via Tport (or fall) */
diff -xconfig.h -xunixconf.h -x'Makefile*' -x'*.o' -ru nethack-3.4.3_orig/src/trap.c nethack-3.4.3/src/trap.c
--- nethack-3.4.3_orig/src/trap.c	2003-12-07 18:39:13.000000000 -0500
+++ nethack-3.4.3/src/trap.c	2005-05-26 20:50:15.990802184 -0400
@@ -958,7 +958,7 @@
 		break;
 	    case LEVEL_TELEP:
 		seetrap(trap);
-		level_tele_trap(trap);
+		(void)level_tele_trap(trap, FALSE);
 		break;
 
 	    case WEB: /* Our luckless player has stumbled into a web. */