diff --git a/Plague.g1a b/Plague.g1a
index 8cba6a3..48881a2 100644
Binary files a/Plague.g1a and b/Plague.g1a differ
diff --git a/src/core.c b/src/core.c
index f79f276..a9bb46b 100644
--- a/src/core.c
+++ b/src/core.c
@@ -47,10 +47,7 @@ void next_frame(struct game *current_game)
             current_game->planes[i]->direction = new_dir;
 
             // Infect the plane
-            if (current_game->grid.data[current_game->planes[i]->x + current_game->planes[i]->y * current_game->grid.width] == 1  && 
-                (current_game->mutations_selected[2] == 3 || 
-                 current_game->mutations_selected[2] == 2 ||
-                 current_game->mutations_selected[2] == 5)) current_game->planes[i]->is_infected = 1;
+            if (current_game->grid.data[current_game->planes[i]->x + current_game->planes[i]->y * current_game->grid.width] == 1  && current_game->mutations_selected[2] == 4) current_game->planes[i]->is_infected = 1;
 
 
         }
diff --git a/src/core.h b/src/core.h
index e3b2d3d..704bf20 100644
--- a/src/core.h
+++ b/src/core.h
@@ -40,7 +40,8 @@ struct game
     int mutations_bought[3][14];
 
     // Research data
-    int research, limit, priority;
+    int research, limit;
+    float priority;
 
     // Humans stats : healthy, infected, dead, healed
     int humans[4];
diff --git a/src/epidemic_engine.c b/src/epidemic_engine.c
index 09d4d40..b504ed3 100644
--- a/src/epidemic_engine.c
+++ b/src/epidemic_engine.c
@@ -15,7 +15,7 @@ bool can_become_infected(const struct grid epidemic_grid, const int mutations_se
     extern const uint8_t world[64][128];
 
     // In case of water, low or high temperature
-    if (world[j][i] == 0 && mutations_selected[2] != 3 && mutations_selected[2] != 2 && mutations_selected[2] != 5) return false;
+    if (world[j][i] == 0 && mutations_selected[2] != 3 && mutations_selected[2] != 4 && mutations_selected[2] != 6) return false;
     if (world[j][i] == 1 && mutations_selected[1] != 1 && mutations_selected[1] != 5) return false;
     if (world[j][i] == 3 && mutations_selected[1] != 2 && mutations_selected[1] != 5) return false;
     
diff --git a/src/mutation_engine.c b/src/mutation_engine.c
index 67f69b0..658c14f 100644
--- a/src/mutation_engine.c
+++ b/src/mutation_engine.c
@@ -80,10 +80,10 @@ void mutation_select(struct game *current_game, const int mutation_menu)
             end = mutation_buy(current_game, c, mutation_menu, table);
         }
                     
-        if (key == KEY_LEFT && c.x > 0) c.x --;
-        if (key == KEY_RIGHT && c.x < 7) c.x ++;
-        if (key == KEY_UP && c.y > 0) c.y --;
-        if (key == KEY_DOWN && c.y < 3) c.y ++;
+        if (key == KEY_LEFT && c.x > 0) c.x = (c.x - 1) % 8;
+        if (key == KEY_RIGHT && c.x < 7) c.x = (c.x + 1) % 8;
+        if (key == KEY_UP && c.y > 0) c.y = (c.y - 1) % 4;
+        if (key == KEY_DOWN && c.y < 3) c.y = (c.y + 1) % 4;
     }
     if (t >= 0) timer_stop(t);
 }
@@ -125,8 +125,7 @@ int mutation_buy(struct game *current_game, const struct cursor c, const int mut
 
                         // Update
                         update_disease(current_game);
-                        current_game->priority += floor((mutation_data->severity + mutation_data->lethality) / 20);
-
+                        current_game->priority += ceil((mutation_data->severity + mutation_data->lethality)/10);
                         const char *msg[5] = {"mutation", "achetee", "", "", ""};
                         message(msg);
                     }