Index: commandline.doc
==================================================================
--- commandline.doc
+++ commandline.doc
@@ -73,10 +73,13 @@
 
 -z
   Load a composite puzzle set. In this case, the <basename> should be the
   full file name of the puzzle, including the suffix.
 
+-+
+  Load the level whose ID number is specified by the "level" resource.
+
 
 === Dot commands ===
 
 .b0
   Disable terminate on errors.

Index: config.doc
==================================================================
--- config.doc
+++ config.doc
@@ -87,11 +87,12 @@
 .keyRepeat
   The keyboard repeat rate, which are two numbers, first the key repeating
   delay and then the key repeating interval.
 
 .level
-  Specifies the 1-based order number of the level to start at.
+  Specifies the 1-based order number of the level to start at. If the -+
+  switch is specified, then it is a 0-based ID number instead.
 
 .listColumns
   Number of columns in the wide mode of the list of levels. If zero or not
   specified, determines automatically by the screen width.
 

Index: game.c
==================================================================
--- game.c
+++ game.c
@@ -1462,10 +1462,14 @@
   solution_replay=1;
   optionquery[1]=Q_progress;
   t=xrm_get_resource(resourcedb,optionquery,optionquery,2);
   pro=t?strtol(t,0,10):0;
   if(main_options['t']) pro=0;
+  if(main_options['+']) {
+    lvl=1;
+    goto start2;
+  }
   optionquery[1]=Q_level;
   t=xrm_get_resource(resourcedb,optionquery,optionquery,2);
   if(n=lvl=t?strtol(t,0,10):0) goto start;
   for(n=1;n<=level_nindex;n++) {
     if(lvl) break;
@@ -1474,10 +1478,11 @@
     if(main_options['t']) printf("*** Level %d\n",n); else printf("Level %d",n);
     if(t=load_level(-n)) {
       printf(": Error during loading: %s\n",t);
       rc=1; continue;
     }
+    start2:
     load_replay();
     if(!replay_count) {
       printf(": Solution is absent, invalid, or for wrong version of this level\n");
       rc=1; continue;
     }

Index: main.c
==================================================================
--- main.c
+++ main.c
@@ -1131,11 +1131,14 @@
   optionquery[1]=Q_maxObjects;
   max_objects=strtoll(xrm_get_resource(resourcedb,optionquery,optionquery,2)?:"",0,0)?:0xFFFF0000L;
   set_tracing();
   annihilate();
   optionquery[1]=Q_level;
-  if(level_ord=strtol(xrm_get_resource(resourcedb,optionquery,optionquery,2)?:"",0,10)) {
+  if(main_options['+']) {
+    level_id=strtol(xrm_get_resource(resourcedb,optionquery,optionquery,2)?:"",0,10);
+    if(log_if_error(load_level(level_id))) fatal("Cannot load level with specified ID\n");
+  } else if(level_ord=strtol(xrm_get_resource(resourcedb,optionquery,optionquery,2)?:"",0,10)) {
     if(level_ord>level_nindex) level_ord=level_nindex;
     log_if_error(load_level(-level_ord));
   }
   optionquery[1]=Q_maxTrigger;
   max_trigger=strtol(xrm_get_resource(resourcedb,optionquery,optionquery,2)?:"",0,10);

Index: man6/heromesh.6
==================================================================
--- man6/heromesh.6
+++ man6/heromesh.6
@@ -51,10 +51,12 @@
 .IP -x
 Does not start the GUI; instead, accepts SQL statements from stdin.
 .IP -z
 Load a composite puzzle set.
 In this case, pass the full file name instead only the base name.
+.IP -+
+Load the level whose ID number is specified by the "level" resource.
 .SH FILES
 A puzzle set consists of four files, with filename suffixes
 .BR ".class" ", " ".xclass" ", " ".level" ", and " ".solution" "."
 A composite puzzle set consists of a single file.
 .TP