diff --git a/elalien.lua b/elalien.lua
index ab4d166..f82e958 100644
--- a/elalien.lua
+++ b/elalien.lua
@@ -1,4 +1,4 @@
-elalien={hab=59,x=24,y=24,flip=true,goup=true,frame=8,stairscooldown=0,wait=0,step=0,anim={8,9,8,10},bb={x=4,y=0,w=8,h=16},scene_intro=false,scene_object=false}
+elalien={hab=38,x=24,y=24,flip=true,goup=true,frame=8,stairscooldown=0,wait=0,step=0,anim={8,9,8,10},bb={x=4,y=0,w=8,h=16},scene_intro=false,scene_object=false}
 
 function elalien.init()
     elalien.hit=elalien.hit
@@ -20,7 +20,7 @@ end
 function elalien.update_normal()
     elalien.wait=elalien.wait+1
 
-    if elalien.wait==6 then
+    if elalien.wait>=6 then
         elalien.wait=0
         if elalien.stairscooldown>0 then elalien.stairscooldown=elalien.stairscooldown-1 end
         elalien.step=(elalien.step+1)%4
@@ -30,6 +30,13 @@ function elalien.update_normal()
         if not elalien.flip and elalien.x==84 then
             elalien.hab=elalien.hab+1
             elalien.x=-4
+        elseif check_tile(elalien.hab,elalien.x+inc,elalien.y+14)==tiletype.nonpc then
+            if rnd(10)<8 then
+                elalien.update=elalien.update_jumping
+                elalien.step=0
+            else
+                elalien.flip=not elalien.flip
+            end
         elseif check_tile(elalien.hab,elalien.x+inc,elalien.y+14)<tiletype.half then
             if elalien.flip then
                 elalien.x=elalien.x-2
@@ -41,7 +48,9 @@ function elalien.update_normal()
                 elalien.x=84
             end
         elseif check_tile(elalien.hab,elalien.x+inc,elalien.y+6)<tiletype.half then
-            if rnd(2)==0 then
+            local r=rnd(2)
+            if check_tile(elalien.hab,elalien.x+inc,elalien.y+14)==tiletype.block then r=0 end
+            if r==0 then
                 elalien.update=elalien.update_jumping
                 elalien.step=0
             else
@@ -63,8 +72,10 @@ function elalien.update_normal()
             --end
         end
 
-        if check_tile(elalien.hab,elalien.x+6,elalien.y+8)==tiletype.stair and elalien.stairscooldown==0 then
-            if rnd(10)<3 then
+        if elalien.stairscooldown==0 and
+            check_tile(elalien.hab,elalien.x+6,elalien.y+8)==tiletype.stair and
+            check_tile(elalien.hab,elalien.x+14,elalien.y+8)==tiletype.stair then
+            if rnd(10)<6 then
                 elalien.update=elalien.update_stairs
                 if check_tile(elalien.hab,elalien.x+4,elalien.y+16)==tiletype.block then
                     elalien.goup=true
@@ -83,11 +94,13 @@ function elalien.update_normal()
 
         if check_tile(elalien.hab,elalien.x+4,elalien.y+16)==tiletype.void and ((elalien.x+4)&7==0 or check_tile(elalien.hab,elalien.x+12,elalien.y+16)==tiletype.void) then
             local option=rnd(10)
+            if elalien.stairscooldown>0 then option=0 end
             if option<5 then
                 elalien.update=elalien.update_falling
             elseif option<8 then
                 elalien.update=elalien.update_jumping
                 elalien.step=0
+                elalien.wait=0
             else
                 elalien.flip=not elalien.flip
             end
@@ -112,14 +125,14 @@ function elalien.update_jumping()
     elalien.frame=9
     elalien.wait=elalien.wait+1
 
-    if elalien.wait==6 then
+    if elalien.wait>=6 then
         elalien.wait=0
         
         local inc=12 if elalien.flip then inc=2 end
         if not elalien.flip and elalien.x==84 then
             elalien.hab=elalien.hab+1
             elalien.x=-4
-        elseif check_tile(elalien.hab,elalien.x+inc,elalien.y+14)<tiletype.half and check_tile(elalien.hab,elalien.x+inc,elalien.y+16)~=tiletype.void then
+        elseif check_tile(elalien.hab,elalien.x+inc,elalien.y+14)<tiletype.half then
             if elalien.flip then
                 elalien.x=elalien.x-2
             else
@@ -154,7 +167,7 @@ function elalien.update_falling()
     elalien.frame=9
     elalien.wait=elalien.wait+1
 
-    if elalien.wait==6 then
+    if elalien.wait>=6 then
         elalien.wait=0
 
         local inc=12 if elalien.flip then inc=2 end
@@ -193,7 +206,7 @@ function elalien.update_stairs()
     elalien.frame=11
     elalien.wait=elalien.wait+1
 
-    if elalien.wait==6 then
+    if elalien.wait>=6 then
         elalien.wait=0
 
         --if btn(KEY_RIGHT) then
diff --git a/main.lua b/main.lua
index 2d806cc..ee64f3a 100644
--- a/main.lua
+++ b/main.lua
@@ -155,7 +155,7 @@ function update_game()
         prnt("x"..abad.vides,114,13,2)
         rectfill(102+(abad.energia>>1),30,122,37,16)
 
-        mapa_update(abad.hab,premiere.hab)
+        mapa_update(abad.hab,elalien.hab)
 
         for key,actor in pairs(actors) do
             actor:update()
diff --git a/map.lua b/map.lua
index 9c4ca0d..f907e47 100644
--- a/map.lua
+++ b/map.lua
@@ -64,8 +64,8 @@ mapa={
         42,43,256,256,256,256,65,256,256,256,256,64,
         256,41,256,67,256,256,256,256,68,256,256,256,
         256,41,256,256,256,66,256,256,256,256,256,256,
-        256,256,256,64,256,256,256,256,67,256,67,256,
-        256,256,256,256,256,256,65,256,256,256,256,256,
+        256,256,256,64,256,256,65,256,67,256,67,256,
+        256,256,256,256,256,256,256,256,256,256,256,256,
         42,43,20,21,20,21,20,21,20,21,20,21,
         
     },
@@ -74,8 +74,8 @@ mapa={
         67,256,256,256,256,65,256,256,256,256,64,256,
         256,256,67,256,256,256,256,68,256,256,256,256,
         256,256,256,256,66,256,256,256,256,256,256,67,
-        256,256,64,256,256,256,256,67,256,67,256,256,
-        256,256,256,256,256,65,256,256,256,256,256,256,
+        256,256,64,256,256,65,256,67,256,67,256,256,
+        256,256,256,256,256,111,111,256,256,256,256,256,
         20,21,20,21,17,256,256,17,20,21,20,21,
         
     },
@@ -84,8 +84,8 @@ mapa={
         256,256,256,256,65,256,256,256,256,64,17,17,
         256,67,256,256,256,256,68,256,256,256,17,256,
         256,256,256,66,256,256,256,256,256,256,17,256,
-        256,64,256,256,256,256,67,256,67,256,256,256,
-        256,256,256,256,65,256,256,256,256,256,256,256,
+        256,64,256,256,65,256,67,256,67,256,256,256,
+        256,256,256,256,256,256,256,256,256,256,256,256,
         20,21,20,21,20,21,20,21,20,21,20,21,
         
     },
@@ -173,8 +173,8 @@ mapa={
     {
         44,45,44,45,41,256,256,41,44,45,44,45,
         256,256,256,256,256,69,256,256,256,256,256,256,
-        256,256,256,256,256,256,256,256,256,256,256,256,
         256,256,256,256,256,256,69,256,256,256,256,256,
+        256,256,256,256,256,111,111,256,256,256,256,256,
         256,256,256,41,41,256,69,41,41,256,256,256,
         45,44,45,42,43,256,256,42,43,44,45,44,
         
@@ -375,8 +375,8 @@ mapa={
         29,256,256,256,256,256,69,256,256,256,256,28,
         256,256,98,96,98,256,256,98,98,96,256,256,
         256,256,99,256,100,256,256,99,256,100,256,256,
-        256,256,256,256,256,69,256,256,10,11,256,256,
-        29,28,29,28,29,256,256,28,10,11,29,28,
+        256,256,256,256,256,111,111,256,10,11,256,256,
+        29,28,29,28,29,69,256,28,10,11,29,28,
         
     },
     -- 39
@@ -385,8 +385,8 @@ mapa={
         256,256,25,25,256,256,256,256,256,256,106,24,
         256,256,256,69,256,256,256,256,256,256,95,24,
         256,256,256,256,78,97,107,108,256,106,105,24,
-        256,256,69,256,94,101,102,110,103,105,98,24,
-        28,29,256,256,28,29,28,29,28,29,28,29,
+        256,256,111,111,94,101,102,110,103,105,98,24,
+        28,29,69,256,28,29,28,29,28,29,28,29,
         
     },
     -- 40
@@ -475,8 +475,8 @@ mapa={
         256,256,256,256,256,256,69,256,10,11,256,256,
         256,256,96,97,256,256,69,256,10,11,256,256,
         256,115,99,100,256,256,256,256,10,11,256,256,
-        256,101,102,103,256,69,256,256,10,11,256,256,
-        19,18,19,18,19,256,256,18,19,18,19,18,
+        256,101,102,103,256,111,111,256,10,11,256,256,
+        19,18,19,18,19,69,256,18,19,18,19,18,
         
     },
     -- 49
@@ -484,9 +484,9 @@ mapa={
         20,21,256,69,18,19,18,19,20,21,20,21,
         256,256,256,256,256,256,256,256,256,256,114,256,
         256,256,69,256,256,256,114,256,256,256,256,256,
-        256,114,69,256,256,256,256,256,17,18,19,17,
-        256,256,256,256,18,19,18,19,18,19,18,19,
-        18,19,256,256,17,18,19,18,19,18,19,17,
+        256,114,69,111,256,256,256,256,17,18,19,17,
+        256,256,111,256,18,19,18,19,18,19,18,19,
+        18,19,256,69,17,18,19,18,19,18,19,17,
         
     },
     -- 50
@@ -575,7 +575,7 @@ mapa={
         256,256,256,256,256,69,256,256,256,256,256,256,
         256,113,70,71,114,256,256,112,107,108,113,256,
         256,256,86,87,256,256,69,256,109,110,256,256,
-        256,256,256,256,256,256,69,256,256,256,256,256,
+        256,256,256,256,256,111,111,256,256,256,256,256,
         37,36,37,36,37,256,256,36,37,36,37,36,
         
     },
@@ -584,7 +584,7 @@ mapa={
         34,35,256,256,34,35,34,35,34,35,34,35,
         256,256,256,69,256,256,256,256,256,256,256,256,
         256,256,69,256,256,256,97,96,256,256,256,256,
-        256,256,256,256,256,256,99,100,256,256,256,256,
+        256,256,111,111,256,256,99,100,256,256,256,256,
         256,41,120,119,41,256,256,256,8,9,256,256,
         3,41,46,47,41,3,36,37,8,9,36,37,
         
@@ -675,7 +675,7 @@ mapa={
         24,97,256,256,256,256,256,256,256,256,256,256,
         24,99,256,256,256,69,256,256,256,256,256,256,
         24,256,95,256,113,69,256,256,114,75,76,256,
-        24,101,102,103,256,256,256,256,256,91,92,256,
+        24,101,102,103,256,111,111,256,256,91,92,256,
         28,28,29,28,29,256,69,28,29,28,29,28,
         
     },
@@ -774,7 +774,7 @@ mapa={
         51,52,53,51,52,256,256,52,53,51,52,17,
         256,256,256,256,256,256,69,256,256,256,256,17,
         256,256,256,256,256,69,256,256,256,256,256,17,
-        256,256,256,256,256,256,256,106,256,256,78,17,
+        256,256,256,256,256,111,111,106,256,256,78,17,
         256,256,256,256,17,118,119,17,256,95,94,17,
         51,52,53,53,51,53,52,53,51,52,51,17,
         
diff --git a/mapa.lua b/mapa.lua
index 7b23017..81282b2 100644
--- a/mapa.lua
+++ b/mapa.lua
@@ -1,5 +1,5 @@
 --mapa={}
-tiletype={void=0,stair=1,switch=2,half=3,block=4}
+tiletype={void=0,nonpc=1,stair=2,switch=3,half=4,block=5}
 mapa.wait=0
 mapa.step=0
 function mapa_do_backup()
@@ -137,6 +137,8 @@ function check_tile(hab,x,y)
         return tiletype.switch
     elseif tile<64 then
         return tiletype.block
+    elseif tile==111 then
+        return tiletype.nonpc
     else
         return tiletype.void
     end
diff --git a/tiles.gif b/tiles.gif
index 8ebaae5..9a489e2 100644
Binary files a/tiles.gif and b/tiles.gif differ