diff --git a/environment.cpp b/environment.cpp
index 80ce5405..06214d0f 100644
--- a/environment.cpp
+++ b/environment.cpp
@@ -42,6 +42,7 @@ namespace hr {
 #define HF_ALT        Flag(29)
 #define HF_MONK       Flag(30)
 #define HF_WESTWALL   Flag(31)
+#define HF_JUMP       Flag(32)
 #endif
 
 EX flagtype havewhat, hadwhat;
@@ -408,6 +409,8 @@ EX void bfs() {
             if(c2->monst == moBat) havewhat |= HF_BATS | HF_EAGLES;
             if(c2->monst == moEagle) havewhat |= HF_EAGLES;
             }
+          else if(among(c2->monst, moFrog, moVaulter, moPhaser))
+            havewhat |= HF_JUMP;
           else if(c2->monst == moReptile) havewhat |= HF_REPTILE;
           else if(isLeader(c2->monst)) havewhat |= HF_LEADER;
           else if(c2->monst == moEarthElemental) havewhat |= HF_EARTH;
diff --git a/locations.cpp b/locations.cpp
index 977be055..e83c7777 100644
--- a/locations.cpp
+++ b/locations.cpp
@@ -448,6 +448,7 @@ constexpr int STRONGWIND = 99;
 constexpr int FALL = 98;
 constexpr int NO_SPACE = 97;
 constexpr int TELEPORT = 96;
+constexpr int JUMP = 95;
 
 namespace whirlwind { cell *jumpDestination(cell*); }
 
diff --git a/monstermove.cpp b/monstermove.cpp
index 90165b78..bc5734d8 100644
--- a/monstermove.cpp
+++ b/monstermove.cpp
@@ -151,6 +151,13 @@ EX void moveMonster(const movei& mi) {
     }
   
   if(fri || isBug(m) || items[itOrbDiscord]) stabbingAttack(cf, ct, m);
+  
+  if(mi.d == JUMP && m == moVaulter) {
+    cell *cm = common_neighbor(cf, ct);
+    if(cm->wall == waShrub) cm->wall = waNone;
+    if(cm->monst)
+      attackMonster(cm, AF_NORMAL | AF_MSG | AF_GETPLAYER, m);
+    }
 
   if(isLeader(m)) {
     if(ct->wall == waBigStatue) {
@@ -1165,6 +1172,11 @@ EX void groupmove(eMonster movtype, flagtype mf) {
       cell *c2 = whirlwind::jumpFromWhereTo(c, false);
       groupmove2(movei(c2, c, STRONGWIND), movtype, mf);
       }
+    
+    if(among(movtype, moFrog, moVaulter, moPhaser) && c->monst == moNone && !isPlayerOn(c)) {
+      forCellEx(c2, c) forCellEx(c3, c2)
+        groupmove2(movei(c3, c, JUMP), movtype, mf);
+      }
     }
 
   if(movtype != moDragonHead) for(int i=0; i<isize(dcal); i++) {
@@ -1951,6 +1963,12 @@ EX void movemonsters() {
   if(havewhat & HF_EAGLES) groupmove(moEagle, MF_NOATTACKS | MF_ONLYEAGLE);
   DEBB(DF_TURN, ("eagles"));
   if(havewhat & HF_REPTILE) groupmove(moReptile, 0);
+  DEBB(DF_TURN, ("jumpers"));
+  if(havewhat & HF_JUMP) {
+    groupmove(moFrog, 0);
+    groupmove(moVaulter, 0);
+    groupmove(moPhaser, 0);
+    }
   DEBB(DF_TURN, ("air"));
   if(havewhat & HF_AIR) {
     airmap.clear();
diff --git a/passable.cpp b/passable.cpp
index 0a81b123..a1a13d98 100644
--- a/passable.cpp
+++ b/passable.cpp
@@ -448,7 +448,12 @@ EX bool notNearItem(cell *c) {
   return true;
   }
 
+EX bool isNeighbor1(cell *f, cell *w) {
+  return !f || f == w || isNeighbor(f, w);
+  }
+
 EX bool passable_for(eMonster m, cell *w, cell *from, flagtype extra) {
+  cell *dummy;
   if(w->monst && !(extra & P_MONSTER) && !isPlayerOn(w)) 
     return false;
   if(m == moWolf) {
@@ -524,6 +529,12 @@ EX bool passable_for(eMonster m, cell *w, cell *from, flagtype extra) {
       }
     return !pseudohept(w) && passable(w, from, extra);
     }
+  if(m == moFrog)
+    return (!from || from == w) ? passable(w, from, extra) : check_jump(from, w, extra, dummy) == 3;
+  if(m == moPhaser)
+    return isNeighbor1(from, w) ? passable(w, from, extra) : check_phase(from, w, extra, dummy) == 3;
+  if(m == moVaulter)
+    return isNeighbor1(from, w) ? passable(w, from, extra) : check_vault(from, w, extra, dummy) == 6;
   if(m == moAltDemon) {
     if(extra & P_ONPLAYER) {
       if(isPlayerOn(w)) return true;