diff --git a/bin/back b/bin/back
index 539a523..9ed0509 100755
Binary files a/bin/back and b/bin/back differ
diff --git a/bots/botBase.ml b/bots/botBase.ml
index 69ebad4..6ce06e7 100644
--- a/bots/botBase.ml
+++ b/bots/botBase.ml
@@ -78,6 +78,7 @@ let trackDistance  = read_float meta metai in     (*
   float (between 0.0 and 0.5) - this is the width of the black area on both side of the tracks 
   in other words, the width of the track is (except for start and finish) roomSize*(1-2*trackDistance)
 *)
+let magneticField = read_float meta metai in      (* workd just like in induction : v ^ B is added to the speed each tick *)
 
 close_in file ;
 (*Printf.printf "%d %d %d %f %f %f\n" roomSize maximumSpeed playerRadius friction restitutionFactor trackDistance ;;*)
diff --git a/bots/follow.cmi b/bots/follow.cmi
index 5412c84..017f167 100644
Binary files a/bots/follow.cmi and b/bots/follow.cmi differ
diff --git a/bots/follow.cmx b/bots/follow.cmx
index 6a58107..7a576a3 100644
Binary files a/bots/follow.cmx and b/bots/follow.cmx differ
diff --git a/bots/follow.ml b/bots/follow.ml
index 7fac960..23c2b1c 100644
--- a/bots/follow.ml
+++ b/bots/follow.ml
@@ -81,6 +81,7 @@ let trackDistance  = read_float meta metai in     (*
   float (between 0.0 and 0.5) - this is the width of the black area on both side of the tracks 
   in other words, the width of the track is (except for start and finish) roomSize*(1-2*trackDistance)
 *)
+let magneticField = read_float meta metai in      (* workd just like in induction : v ^ B is added to the speed each tick *)
 
 close_in file ;
 (*Printf.printf "%d %d %d %f %f %f\n" roomSize maximumSpeed playerRadius friction restitutionFactor trackDistance ;;*)
diff --git a/bots/follow.o b/bots/follow.o
index 7c7d216..5b78fec 100644
Binary files a/bots/follow.o and b/bots/follow.o differ
diff --git a/bots/follow1 b/bots/follow1
index e2cbd35..e728773 100755
Binary files a/bots/follow1 and b/bots/follow1 differ
diff --git a/bots/follow2 b/bots/follow2
index e2cbd35..e728773 100755
Binary files a/bots/follow2 and b/bots/follow2 differ
diff --git a/bots/follow3 b/bots/follow3
index e2cbd35..e728773 100755
Binary files a/bots/follow3 and b/bots/follow3 differ
diff --git a/bots/follow4 b/bots/follow4
index e2cbd35..e728773 100755
Binary files a/bots/follow4 and b/bots/follow4 differ
diff --git a/lastActions.txt b/lastActions.txt
index bab0839..344fda5 100644
--- a/lastActions.txt
+++ b/lastActions.txt
@@ -1,67 +1,68 @@
-15.283312 -168.132427
--3.875293 -217.394574
--2.300064 -222.591425
--15.045042 -169.714650
-1.082855 -227.095122
-178.596429 21.737178
--4.391650 -207.233032
--12.266175 -227.148929
--16.871035 -209.846368
-187.346942 6.343882
-201.031828 14.624638
-20.884507 -226.513802
--23.428113 -219.487861
-6.668101 177.977553
--8.282273 188.856052
--8.118353 -220.432417
-214.969311 8.139475
--20.975506 -163.732759
-19.505170 178.521445
-14.059300 -208.287419
--13.582572 202.643783
-165.257843 -14.161400
-183.897469 2.030179
-232.650472 20.227691
--8.214584 205.892621
-184.797474 15.493847
-186.741640 -16.724432
-20.334129 231.449697
--15.194962 -197.016532
-185.222560 20.876855
-164.962028 0.223672
--10.536891 227.902529
--2.041096 -197.446820
-209.887356 -11.992982
-0.000248 165.684814
-23.335144 -220.548384
-192.922489 17.561281
-218.486970 5.907496
-18.563320 169.000059
--8.025218 -216.899723
--19.987451 203.963417
-220.426775 -11.794697
--184.439240 -5.946276
-202.999492 3.017057
--197.157589 5.350030
--19.131913 211.412648
--177.314902 -0.421059
-8.650374 216.687713
--211.519919 -4.182964
--225.827554 19.255477
--186.604445 -0.413666
--220.995867 1.579061
--196.286611 3.300536
--215.596596 15.150045
--177.279262 -8.471317
--221.220200 -17.991671
--212.905471 -21.910692
--207.860142 19.681900
--167.551422 7.668736
--224.129291 -8.870528
-17.515601 -183.742930
--211.725099 11.037961
--9.316739 -175.104654
-8.854149 223.062188
--0.000750 -194.960110
--216.098329 0.274767
-17.444249 -210.184344
+-18.422713 -176.076801
+-7.020887 -230.177778
+-4.520750 -219.581399
+-4.463651 -166.253025
+185.488698 -20.745149
+194.457151 -12.645542
+15.536898 -214.021351
+-14.661352 -229.591860
+169.429180 -12.357431
+205.176534 -25.599484
+-11.796178 -230.418216
+24.377212 -213.365001
+17.041185 179.830947
+190.815708 20.580724
+189.314747 -12.899597
+-11.629750 -211.150224
+12.337279 -173.726717
+0.000254 184.344335
+-10.038741 198.842165
+5.666371 -213.933822
+-14.627645 -168.695567
+-14.523843 -173.186164
+-16.809179 199.152874
+5.907002 -211.095601
+-18.909848 -167.973241
+19.054749 -163.897611
+7.139926 207.663326
+0.272239 -224.970670
+187.598498 16.404734
+179.769347 -16.771815
+-19.361183 -196.079116
+215.692477 -3.667610
+15.616109 -189.003404
+-17.531907 182.190821
+17.989057 -190.400513
+-9.511825 234.189681
+199.192961 2.734451
+-186.307904 17.161294
+186.595470 -24.932493
+210.766575 -27.416865
+220.868582 6.016359
+-163.798702 17.955681
+14.836006 182.767932
+216.437004 25.342977
+18.276022 217.322325
+-183.591585 -21.481311
+-194.045676 -0.224849
+234.467865 14.146990
+-213.300653 -11.066723
+-180.329256 13.394246
+-197.220384 -8.255668
+6.316474 208.755529
+-206.630095 11.522920
+-185.564188 -4.332933
+9.899927 180.108674
+-232.050486 -21.155205
+-201.660961 -14.888540
+-164.773539 -8.076386
+-188.455821 -3.786201
+-217.261009 -4.470115
+-212.863197 -3.619766
+-7.006592 -177.015214
+15.446748 -180.253797
+-209.173837 20.790962
+-204.436731 14.747903
+-229.235179 19.156590
+-6.343615 -186.631927
+-3.893746 -229.179855
diff --git a/leaderboard.txt b/leaderboard.txt
index 745af54..2a036af 100644
--- a/leaderboard.txt
+++ b/leaderboard.txt
@@ -5,7 +5,7 @@ name, elo
 ./bots/dumb4 1392
 ./bots/dumb5 540
 ./bots/dumb6 562
-./bots/follow1 525
-./bots/follow2 499
-./bots/follow3 548
-./bots/follow4 509
+./bots/follow1 562
+./bots/follow2 600
+./bots/follow3 612
+./bots/follow4 545
diff --git a/obj/base.o b/obj/base.o
index 9afc501..238d411 100644
Binary files a/obj/base.o and b/obj/base.o differ
diff --git a/obj/cars.o b/obj/cars.o
index 56f51e3..e5eb2b7 100644
Binary files a/obj/cars.o and b/obj/cars.o differ
diff --git a/obj/collisions.o b/obj/collisions.o
index c3d6c88..1940dc7 100644
Binary files a/obj/collisions.o and b/obj/collisions.o differ
diff --git a/obj/display.o b/obj/display.o
index 66c2eda..1f778b9 100644
Binary files a/obj/display.o and b/obj/display.o differ
diff --git a/obj/main.o b/obj/main.o
index a403e26..9761d0a 100644
Binary files a/obj/main.o and b/obj/main.o differ
diff --git a/obj/music.o b/obj/music.o
index 0935dde..0c18e4c 100644
Binary files a/obj/music.o and b/obj/music.o differ
diff --git a/obj/rooms.o b/obj/rooms.o
index 56f7553..382bc23 100644
Binary files a/obj/rooms.o and b/obj/rooms.o differ
diff --git a/obj/structure.o b/obj/structure.o
index d4087f3..be71b7e 100644
Binary files a/obj/structure.o and b/obj/structure.o differ
diff --git a/output.txt b/output.txt
index e8cf91e..a01ac1c 100644
--- a/output.txt
+++ b/output.txt
@@ -1,8 +1,8 @@
 4
-0 (1 2) (74.74 30.15)
-1 (1 2) (64.27 43.70)
-2 (1 2) (41.29 41.90)
-3 (1 3) (74.08 81.17)
+0 (1 3) (25.15 20.43)
+1 (1 2) (46.28 29.61)
+2 (1 2) (9.84 44.40)
+3 (1 4) (30.06 26.11)
 3
 
 5 9
@@ -12,6 +12,6 @@ S...035.0
 .0..31115
 .2115....
 
-100 200 5 0.90 0.80 0.20
+100 200 5 0.90 0.80 0.20 0.60
 
-Room Size, Maximum speed, Player Radius, Friction, Restitution factor, Track Distance to Edge, 
\ No newline at end of file
+Room Size, Maximum speed, Player Radius, Friction, Restitution factor, Track Distance to Edge, Magnetic Field
\ No newline at end of file
diff --git a/src/collisions.c b/src/collisions.c
index abe9594..d23893f 100644
--- a/src/collisions.c
+++ b/src/collisions.c
@@ -257,6 +257,31 @@ void apply_friction(int nPl) {
     players[nPl].c->vel.fy *= (1.0 - FRICTION*DT);
 }
 
+double addVX = 0.0;
+double addVY = 0.0;
+void addEnviroSpeed(int nPl) {
+    car* c = players[nPl].c;
+
+    // Wind
+    if(WIND_X*WIND_X + WIND_Y*WIND_Y >= 0.001) {
+        c->vel.fx += WIND_X*DT;
+        c->vel.fx += WIND_Y*DT;
+    }
+
+    // B
+    if(B > 0.001) {
+        addVX = c->vel.fy*B;
+        addVY = -c->vel.fx*B;
+
+        c->vel.fx += addVX*DT;
+        c->vel.fy += addVY*DT;
+    }
+}
+
+void removeEnviroSpeed(int nPl) {
+    // no
+}
+
 // -- //
 
 // return true iif the car has moved
@@ -268,56 +293,80 @@ bool updateCar(level* lvl, int nPl) {
                 return false;
 
             case START:
+                addEnviroSpeed(nPl);
                 move_on_START(nPl);
+                removeEnviroSpeed(nPl);
+
                 bumpOtherCars(nPl);
                 apply_friction(nPl);
                 updateChunk(lvl, nPl);
                 return true;
 
             case END:
+                addEnviroSpeed(nPl);
                 move_on_FINISH(nPl);
+                removeEnviroSpeed(nPl);
+
                 bumpOtherCars(nPl);
                 apply_friction(nPl);
                 updateChunk(lvl, nPl);
                 return true;
                 
             case STR_V:
+                addEnviroSpeed(nPl);
                 move_on_STR_V(nPl);
+                removeEnviroSpeed(nPl);
+
                 bumpOtherCars(nPl);
                 apply_friction(nPl);
                 updateChunk(lvl, nPl);
                 return true;
 
             case STR_H:
+                addEnviroSpeed(nPl);
                 move_on_STR_H(nPl);
+                removeEnviroSpeed(nPl);
+
                 bumpOtherCars(nPl);
                 apply_friction(nPl);
                 updateChunk(lvl, nPl);
                 return true;
 
             case TURN_NE:
+                addEnviroSpeed(nPl);
                 move_on_TURN(nPl, ROOM_SIZE, 0);
+                removeEnviroSpeed(nPl);
+
                 bumpOtherCars(nPl);
                 apply_friction(nPl);
                 updateChunk(lvl, nPl);
                 return true;
 
             case TURN_NW:
+                addEnviroSpeed(nPl);
                 move_on_TURN(nPl, 0, 0);
+                removeEnviroSpeed(nPl);
+
                 bumpOtherCars(nPl);
                 apply_friction(nPl);
                 updateChunk(lvl, nPl);
                 return true;
 
             case TURN_SE:
+                addEnviroSpeed(nPl);
                 move_on_TURN(nPl, ROOM_SIZE, ROOM_SIZE);
+                removeEnviroSpeed(nPl);
+
                 bumpOtherCars(nPl);
                 apply_friction(nPl);
                 updateChunk(lvl, nPl);
                 return true;
 
             case TURN_SW:
+                addEnviroSpeed(nPl);
                 move_on_TURN(nPl, 0, ROOM_SIZE);
+                removeEnviroSpeed(nPl);
+
                 bumpOtherCars(nPl);
                 apply_friction(nPl);
                 updateChunk(lvl, nPl);
diff --git a/src/main.c b/src/main.c
index af10e41..3c8d567 100644
--- a/src/main.c
+++ b/src/main.c
@@ -61,7 +61,7 @@ void cameraActions(level* lvl, bool* halt, int* cx, int* cy, int* dezoom, int* s
                         break;
 
                     case SDLK_m:
-                        *dezoom = min(3, *dezoom+1);
+                        *dezoom = min(5, *dezoom+1);
                         *sizeR = min(WIDTH, HEIGHT)/(2*(*dezoom)+1)+1;
                         break;
 
@@ -245,6 +245,7 @@ int main(int argc, char** argv) {
         } else {
             // no movement
             placeRectToRenderer(rend, 0, HEIGHT-50, 50, 50, 255, 32, 32, 192);
+            //B *= -1.0;
             updateWins(ranks);
             if(remainingTurns != 0)parse_all_players(stage, execs);
             if(remainingTurns > 0) {
diff --git a/src/structure.c b/src/structure.c
index 80aba1f..7c77c29 100644
--- a/src/structure.c
+++ b/src/structure.c
@@ -14,7 +14,7 @@ const int MAX_SPEED = 200;               // m/s
 const double DIST_EDGE = 0.2;
 const double START_EDGE = 0.05;
 const double RESTITUTION_WALL = 0.8;
-const double RESTITUTION_PLAYER = 0.8;  // keep equal to prevouis constant
+const double RESTITUTION_PLAYER = 0.8;  // keep equal to previous constant
 
 const int PLAYER_R = 5;
 const int MAX_THETA_SPAWN = 80;         // degrees
@@ -30,6 +30,11 @@ const double EPSILON = 1.0/4096.0;
 const double DELTA_V = 7.0;         // %
 const double DELTA_THETA = 7.0;     // degrees
 
+const double WIND_X = 0.0;
+const double WIND_Y = 0.0;
+
+double B = 0.6;   // 0.6 works fine
+
 // ------------------------------------------------------------------------------------------ //
 
 void write_output(char* stream, level* lvl, int nPl) {
@@ -63,8 +68,8 @@ void write_output(char* stream, level* lvl, int nPl) {
         fprintf(ptr, "\n");
     }
     fprintf(ptr, "\n");
-    fprintf(ptr, "%d %d %d %.2lf %.2lf %.2lf\n", ROOM_SIZE, MAX_SPEED, PLAYER_R, FRICTION, RESTITUTION_WALL, DIST_EDGE);
-    fprintf(ptr, "\nRoom Size, Maximum speed, Player Radius, Friction, Restitution factor, Track Distance to Edge, ");
+    fprintf(ptr, "%d %d %d %.2lf %.2lf %.2lf %.2lf\n", ROOM_SIZE, MAX_SPEED, PLAYER_R, FRICTION, RESTITUTION_WALL, DIST_EDGE, B);
+    fprintf(ptr, "\nRoom Size, Maximum speed, Player Radius, Friction, Restitution factor, Track Distance to Edge, Magnetic Field");
     fclose(ptr);
 }
 
diff --git a/src/structure.h b/src/structure.h
index eccabbe..d629756 100644
--- a/src/structure.h
+++ b/src/structure.h
@@ -118,6 +118,11 @@ extern double* remainingD;
 extern double minRemD;
 extern double maxRemD;
 
+extern const double WIND_X;
+extern const double WIND_Y;
+
+extern double B;
+
 // -------------------------------------------------------------------------------- //
 
 void write_output(char* stream, level* lvl, int nPl);
diff --git a/tempLeader.txt b/tempLeader.txt
index 745af54..2a036af 100644
--- a/tempLeader.txt
+++ b/tempLeader.txt
@@ -5,7 +5,7 @@ name, elo
 ./bots/dumb4 1392
 ./bots/dumb5 540
 ./bots/dumb6 562
-./bots/follow1 525
-./bots/follow2 499
-./bots/follow3 548
-./bots/follow4 509
+./bots/follow1 562
+./bots/follow2 600
+./bots/follow3 612
+./bots/follow4 545