diff --git a/classes.cpp b/classes.cpp
index 8e4baec9..ce89e586 100644
--- a/classes.cpp
+++ b/classes.cpp
@@ -410,6 +410,9 @@ const char *ruindesc =
   "Once a beautiful city... but now overrun by the mighty Raiders of unknown origin.\n\n"
   "Raiders cannot be harmed with mundane weapons, but each color has its movement restrictions.";
 
+const char *rock_description = 
+  "Shoot the Space Rocks for score. Large Rocks will split into two smaller rocks.";
+  
 monstertype minf[motypes] = {
   #define MONSTER(a,b,c,d,e,f,g,h) {a,b,c,e,g,h},
   #include "content.cpp"
diff --git a/content.cpp b/content.cpp
index 62ec25c8..ad793035 100644
--- a/content.cpp
+++ b/content.cpp
@@ -1257,9 +1257,9 @@ LAND( 0x30FF30, "Irradiated Field", laVariant, ZERO, itVarTreasure, RESERVED,
 
 // add new content here
 
-LAND( 0x202020, "Asteroids", laAsteroids, ZERO, itAsteroid, RESERVED, NODESCYET)
-ITEM( '*', 0xFFFFFF, "Ice Diamond", itAsteroid, IC_TREASURE, ZERO, RESERVED, osNone, NODESCYET)
-MONSTER('A', 0x606040, "Asteroid", moAsteroid, ZERO, RESERVED, moAsteroid, NODESCYET)
+LAND( 0x202020, "Space Rocks", laAsteroids, ZERO, itAsteroid, RESERVED, rock_description)
+ITEM( '!', 0xFFD0D0, "Fuel", itAsteroid, IC_TREASURE, ZERO, RESERVED, osNone, rock_description)
+MONSTER('A', 0x606040, "Space Rock", moAsteroid, ZERO, RESERVED, moAsteroid, rock_description)
 
 //shmupspecials
 MONSTER( '@', 0xC0C0C0, "Rogue", moPlayer, ZERO | CF_PLAYER, RESERVED, moNone, "In the Shoot'em Up mode, you are armed with thrown Knives.")
diff --git a/game.cpp b/game.cpp
index 6c30e4d9..78fe9415 100644
--- a/game.cpp
+++ b/game.cpp
@@ -3305,6 +3305,8 @@ bool makeEmpty(cell *c) {
     ;
   else if(c->wall == waGiantRug)
     ;
+  else if(c->wall == waInvisibleFloor)
+    ;
   else if(c->wall == waDock)
     ;
   else if(c->land == laDocks)
diff --git a/graph.cpp b/graph.cpp
index 5c7e7c0b..63c0b47d 100644
--- a/graph.cpp
+++ b/graph.cpp
@@ -5466,7 +5466,7 @@ void drawcell(cell *c, transmatrix V, int spinv, bool mirrored) {
       queuechr(V, 1, ch, darkenedby(asciicol, darken), 2);
       }
     
-    if(vid.grid || (DIM == 3 && c->land == laAsteroids)) {
+    if(vid.grid || c->land == laAsteroids) {
       dynamicval<ld> lw(vid.linewidth, vid.linewidth);
 
       vid.linewidth *= scalefactor;
diff --git a/landgen.cpp b/landgen.cpp
index 7d62fa51..4bb015ff 100644
--- a/landgen.cpp
+++ b/landgen.cpp
@@ -2379,6 +2379,7 @@ void giantLandSwitch(cell *c, int d, cell *from) {
       break;
     
     case laAsteroids:
+      c->wall = waInvisibleFloor;
       break;
     
     case landtypes: break;
diff --git a/landlock.cpp b/landlock.cpp
index 11865230..fc32a9d4 100644
--- a/landlock.cpp
+++ b/landlock.cpp
@@ -1001,6 +1001,7 @@ namespace lv {
   land_validity_t pattern_special = {3, qm3, "Special pattern implemented for this geometry."}; 
   land_validity_t not_3d = {0, q0, "This land does not make much sense in 3D."}; 
   land_validity_t not_binary = {0, q0, "This land does not make much sense in binary tiling."}; 
+  land_validity_t shmup_only = {0, q0, "This land works only in the shmup mode."}; 
   }
 
 // old Daily Challenges should keep their validity forever
@@ -1023,6 +1024,12 @@ land_validity_t& land_validity(eLand l) {
     return disabled;
   #endif
 
+  if(l == laAsteroids) {
+    if(!shmup::on) return shmup_only;
+    if(!bounded) return bounded_only;
+    return specially_designed;
+    }
+
   if(DIM == 3) {
     if(l == laWarpCoast) return ugly_version;
     if(l == laWineyard && hyperbolic && !binarytiling && S7 == 6) return lv::pattern_special;