diff -r 97ba379164ec -r eeae1cb6b6bf hedgewars/uGearsUtils.pas
--- a/hedgewars/uGearsUtils.pas	Fri Sep 28 18:03:32 2012 +0100
+++ b/hedgewars/uGearsUtils.pas	Sat Sep 29 19:26:18 2012 +0400
@@ -41,6 +41,8 @@
 procedure CheckCollision(Gear: PGear); inline;
 procedure CheckCollisionWithLand(Gear: PGear); inline;
 
+function MakeHedgehogsStep(Gear: PGear) : boolean;
+
 var doStepHandlers: array[TGearType] of TGearStepProcedure;
 
 
@@ -682,4 +684,73 @@
         Gear^.State := Gear^.State and (not gstCollision)
 end;
 
+function MakeHedgehogsStep(Gear: PGear) : boolean;
+begin
+    if TestCollisionXwithGear(Gear, hwSign(Gear^.dX)) then if (TestCollisionYwithGear(Gear, -1) = 0) then
+        begin
+        Gear^.Y:= Gear^.Y - _1;
+    if TestCollisionXwithGear(Gear, hwSign(Gear^.dX)) then if (TestCollisionYwithGear(Gear, -1) = 0) then
+        begin
+        Gear^.Y:= Gear^.Y - _1;
+    if TestCollisionXwithGear(Gear, hwSign(Gear^.dX)) then if (TestCollisionYwithGear(Gear, -1) = 0) then
+        begin
+        Gear^.Y:= Gear^.Y - _1;
+    if TestCollisionXwithGear(Gear, hwSign(Gear^.dX)) then if (TestCollisionYwithGear(Gear, -1) = 0) then
+        begin
+        Gear^.Y:= Gear^.Y - _1;
+    if TestCollisionXwithGear(Gear, hwSign(Gear^.dX)) then if (TestCollisionYwithGear(Gear, -1) = 0) then
+        begin
+        Gear^.Y:= Gear^.Y - _1;
+    if TestCollisionXwithGear(Gear, hwSign(Gear^.dX)) then if (TestCollisionYwithGear(Gear, -1) = 0) then
+        begin
+        Gear^.Y:= Gear^.Y - _1;
+        if TestCollisionXwithGear(Gear, hwSign(Gear^.dX)) then
+            Gear^.Y:= Gear^.Y + _6
+        end else Gear^.Y:= Gear^.Y + _5 else
+        end else Gear^.Y:= Gear^.Y + _4 else
+        end else Gear^.Y:= Gear^.Y + _3 else
+        end else Gear^.Y:= Gear^.Y + _2 else
+        end else Gear^.Y:= Gear^.Y + _1
+        end;
+
+    if not TestCollisionXwithGear(Gear, hwSign(Gear^.dX)) then
+        begin
+        Gear^.X:= Gear^.X + SignAs(_1, Gear^.dX);
+        MakeHedgehogsStep:= true
+        end else
+        MakeHedgehogsStep:= false;
+
+    if TestCollisionYwithGear(Gear, 1) = 0 then
+        begin
+        Gear^.Y:= Gear^.Y + _1;
+    if TestCollisionYwithGear(Gear, 1) = 0 then
+        begin
+        Gear^.Y:= Gear^.Y + _1;
+    if TestCollisionYwithGear(Gear, 1) = 0 then
+        begin
+        Gear^.Y:= Gear^.Y + _1;
+    if TestCollisionYwithGear(Gear, 1) = 0 then
+        begin
+        Gear^.Y:= Gear^.Y + _1;
+    if TestCollisionYwithGear(Gear, 1) = 0 then
+        begin
+        Gear^.Y:= Gear^.Y + _1;
+    if TestCollisionYwithGear(Gear, 1) = 0 then
+        begin
+        Gear^.Y:= Gear^.Y + _1;
+    if TestCollisionYwithGear(Gear, 1) = 0 then
+        begin
+        Gear^.Y:= Gear^.Y - _6;
+        Gear^.dY:= _0;
+        Gear^.State:= Gear^.State or gstMoving;
+        exit
+        end;
+        end
+        end
+        end
+        end
+        end
+        end;
+end;
+
 end.