diff --git a/src/player.c b/src/player.c
index fcaba7b..bc2efcc 100644
--- a/src/player.c
+++ b/src/player.c
@@ -45,14 +45,19 @@ void player_move(Map *map_level, Player *player, Direction direction) {
     const char dy = one_px_mov[direction*2+1]*SPEED;
     /* If the player will collide with a hard tile. */
     if(player_collision(map_level, player, direction, P_CENTER)){
+        /* If the will collide with the center of the player. */
         player_fix_position(player, dx, dy);
     }else{
-        /* If he won't collide I just move him normally */
         if(player_collision(map_level, player, direction, P_RIGHTDOWN) ||
            player_collision(map_level, player, direction, P_LEFTUP)){
+            /* If the will collide with the edges of the player. */
             /* I fix his position so he won't be partially in the tile. */
+            /* I invert dx and dy to fix the axis where he is not moving on. */
+            /* Do not replace dx==0 with !dx or dy==0 with !dy, it won't work!
+             */
             player_fix_position(player, dx==0, dy==0);
         }
+        /* If he won't collide with the center, so I just move him normally */
         player->x += dx;
         player->y += dy;
     }
@@ -71,11 +76,11 @@ bool player_collision(Map *map_level, Player *player, Direction direction,
     char dy = one_px_mov[direction*2+1];
     if(!dx){
         dx += nomov_axis_check;
-        dx = dx*(P_WIDTH/2+(nomov_axis_check == P_CENTER));
     }else if(!dy){
         dy += nomov_axis_check;
-        dy = dy*(P_HEIGHT/2+(nomov_axis_check == P_CENTER));
     }
+    dx = dx*(P_WIDTH/2+(nomov_axis_check == P_CENTER));
+    dy = dy*(P_HEIGHT/2+(nomov_axis_check == P_CENTER));
     /* The tile he will go to. */
     int player_tile_x = (player->x+dx)/T_WIDTH;
     int player_tile_y = (player->y+dy)/T_HEIGHT;