diff --git a/snake-game/src/gameplay.rs b/snake-game/src/gameplay.rs
index 69aacf8..2991d7f 100644
--- a/snake-game/src/gameplay.rs
+++ b/snake-game/src/gameplay.rs
@@ -2,6 +2,9 @@ use bevy::prelude::*;
 
 use crate::domain::{Direction, GRID_SIZE, GridBarier, Head, Inert, SnakePath, Velocity};
 
+mod tools;
+use tools::*;
+
 /// Система поворота головы змеи
 pub fn head_rotation(
     input: Res<ButtonInput<KeyCode>>,
@@ -49,103 +52,3 @@ pub fn moving(
         }
     }
 }
-
-/// Разбиение изменения координаты по границам сетки
-fn split_by_grid(src: f32, dst: f32, grid: f32) -> Vec<(f32, f32)> {
-    if grid <= 0.0 {
-        return vec![(dst, dst - src)];
-    };
-
-    let old_grid = src / grid;
-    let new_grid = dst / grid;
-
-    let old_grid_right = old_grid.ceil();
-    let new_grid_right = new_grid.ceil();
-
-    let mut output = Vec::with_capacity(2);
-    if src < dst {
-        let mut src: f32 = src;
-        for step in old_grid_right as i32..new_grid_right as i32 {
-            let step = step as f32 * grid;
-            if step != src {
-                output.push((step, step - src));
-            }
-            src = step;
-        }
-        output.push((dst, dst - src));
-    } else {
-        let mut dst: f32 = dst;
-        for step in new_grid_right as i32..old_grid_right as i32 {
-            let step = step as f32 * grid;
-            if step != dst {
-                output.push((dst, dst - step));
-            }
-            dst = step;
-        }
-        output.push((dst, dst - src));
-        output.reverse();
-    }
-    output
-}
-
-#[cfg(test)]
-mod test {
-    use crate::gameplay::*;
-
-    #[test]
-    fn test_split_by_grid() {
-        // движение вправо
-        assert_eq!(split_by_grid(1.0, 4.0, 5.0), vec![(4.0, 3.0)]);
-        assert_eq!(split_by_grid(3.0, 5.0, 5.0), vec![(5.0, 2.0)]);
-        assert_eq!(split_by_grid(3.0, 6.0, 5.0), vec![(5.0, 2.0), (6.0, 1.0)]);
-        assert_eq!(split_by_grid(3.0, 10.0, 5.0), vec![(5.0, 2.0), (10.0, 5.0)]);
-        assert_eq!(
-            split_by_grid(3.0, 11.0, 5.0),
-            vec![(5.0, 2.0), (10.0, 5.0), (11.0, 1.0)]
-        );
-        assert_eq!(split_by_grid(-2.0, 3.0, 5.0), vec![(0.0, 2.0), (3.0, 3.0)]);
-        assert_eq!(
-            split_by_grid(-6.0, 7.0, 5.0),
-            vec![(-5.0, 1.0), (0.0, 5.0), (5.0, 5.0), (7.0, 2.0)]
-        );
-        assert_eq!(
-            split_by_grid(-6.0, -2.0, 5.0),
-            vec![(-5.0, 1.0), (-2.0, 3.0)]
-        );
-
-        // движение влево
-        assert_eq!(split_by_grid(4.0, 1.0, 5.0), vec![(1.0, -3.0)]);
-        assert_eq!(split_by_grid(5.0, 3.0, 5.0), vec![(3.0, -2.0)]);
-        assert_eq!(split_by_grid(6.0, 3.0, 5.0), vec![(5.0, -1.0), (3.0, -2.0)]);
-        assert_eq!(
-            split_by_grid(10.0, 3.0, 5.0),
-            vec![(5.0, -5.0), (3.0, -2.0)]
-        );
-        assert_eq!(
-            split_by_grid(11.0, 3.0, 5.0),
-            vec![(10.0, -1.0), (5.0, -5.0), (3.0, -2.0)]
-        );
-        assert_eq!(
-            split_by_grid(3.0, -2.0, 5.0),
-            vec![(0.0, -3.0), (-2.0, -2.0)]
-        );
-        assert_eq!(
-            split_by_grid(7.0, -6.0, 5.0),
-            vec![(5.0, -2.0), (0.0, -5.0), (-5.0, -5.0), (-6.0, -1.0)]
-        );
-        assert_eq!(
-            split_by_grid(-2.0, -6.0, 5.0),
-            vec![(-5.0, -3.0), (-6.0, -1.0)]
-        );
-
-        // сценарии с нулевой сеткой
-        assert_eq!(split_by_grid(1.0, 4.0, 0.0), vec![(4.0, 3.0)]);
-        assert_eq!(split_by_grid(4.0, 1.0, 0.0), vec![(1.0, -3.0)]);
-
-        // Сценарии со стартом в узле сетки
-        assert_eq!(split_by_grid(0.0, 1.5, 5.0), vec![(1.5, 1.5)]);
-        assert_eq!(split_by_grid(5.0, 7.0, 5.0), vec![(7.0, 2.0)]);
-        assert_eq!(split_by_grid(0.0, -1.5, 5.0), vec![(-1.5, -1.5)]);
-        assert_eq!(split_by_grid(5.0, 3.0, 5.0), vec![(3.0, -2.0)]);
-    }
-}
diff --git a/snake-game/src/gameplay/tools.rs b/snake-game/src/gameplay/tools.rs
new file mode 100644
index 0000000..9231b2d
--- /dev/null
+++ b/snake-game/src/gameplay/tools.rs
@@ -0,0 +1,99 @@
+/// Разбиение изменения координаты по границам сетки
+pub fn split_by_grid(src: f32, dst: f32, grid: f32) -> Vec<(f32, f32)> {
+    if grid <= 0.0 {
+        return vec![(dst, dst - src)];
+    };
+
+    let old_grid = src / grid;
+    let new_grid = dst / grid;
+
+    let old_grid_right = old_grid.ceil();
+    let new_grid_right = new_grid.ceil();
+
+    let mut output = Vec::with_capacity(2);
+    if src < dst {
+        let mut src: f32 = src;
+        for step in old_grid_right as i32..new_grid_right as i32 {
+            let step = step as f32 * grid;
+            if step != src {
+                output.push((step, step - src));
+            }
+            src = step;
+        }
+        output.push((dst, dst - src));
+    } else {
+        let mut dst: f32 = dst;
+        for step in new_grid_right as i32..old_grid_right as i32 {
+            let step = step as f32 * grid;
+            if step != dst {
+                output.push((dst, dst - step));
+            }
+            dst = step;
+        }
+        output.push((dst, dst - src));
+        output.reverse();
+    }
+    output
+}
+
+#[cfg(test)]
+mod test {
+    use crate::gameplay::*;
+
+    #[test]
+    fn test_split_by_grid() {
+        // движение вправо
+        assert_eq!(split_by_grid(1.0, 4.0, 5.0), vec![(4.0, 3.0)]);
+        assert_eq!(split_by_grid(3.0, 5.0, 5.0), vec![(5.0, 2.0)]);
+        assert_eq!(split_by_grid(3.0, 6.0, 5.0), vec![(5.0, 2.0), (6.0, 1.0)]);
+        assert_eq!(split_by_grid(3.0, 10.0, 5.0), vec![(5.0, 2.0), (10.0, 5.0)]);
+        assert_eq!(
+            split_by_grid(3.0, 11.0, 5.0),
+            vec![(5.0, 2.0), (10.0, 5.0), (11.0, 1.0)]
+        );
+        assert_eq!(split_by_grid(-2.0, 3.0, 5.0), vec![(0.0, 2.0), (3.0, 3.0)]);
+        assert_eq!(
+            split_by_grid(-6.0, 7.0, 5.0),
+            vec![(-5.0, 1.0), (0.0, 5.0), (5.0, 5.0), (7.0, 2.0)]
+        );
+        assert_eq!(
+            split_by_grid(-6.0, -2.0, 5.0),
+            vec![(-5.0, 1.0), (-2.0, 3.0)]
+        );
+
+        // движение влево
+        assert_eq!(split_by_grid(4.0, 1.0, 5.0), vec![(1.0, -3.0)]);
+        assert_eq!(split_by_grid(5.0, 3.0, 5.0), vec![(3.0, -2.0)]);
+        assert_eq!(split_by_grid(6.0, 3.0, 5.0), vec![(5.0, -1.0), (3.0, -2.0)]);
+        assert_eq!(
+            split_by_grid(10.0, 3.0, 5.0),
+            vec![(5.0, -5.0), (3.0, -2.0)]
+        );
+        assert_eq!(
+            split_by_grid(11.0, 3.0, 5.0),
+            vec![(10.0, -1.0), (5.0, -5.0), (3.0, -2.0)]
+        );
+        assert_eq!(
+            split_by_grid(3.0, -2.0, 5.0),
+            vec![(0.0, -3.0), (-2.0, -2.0)]
+        );
+        assert_eq!(
+            split_by_grid(7.0, -6.0, 5.0),
+            vec![(5.0, -2.0), (0.0, -5.0), (-5.0, -5.0), (-6.0, -1.0)]
+        );
+        assert_eq!(
+            split_by_grid(-2.0, -6.0, 5.0),
+            vec![(-5.0, -3.0), (-6.0, -1.0)]
+        );
+
+        // сценарии с нулевой сеткой
+        assert_eq!(split_by_grid(1.0, 4.0, 0.0), vec![(4.0, 3.0)]);
+        assert_eq!(split_by_grid(4.0, 1.0, 0.0), vec![(1.0, -3.0)]);
+
+        // Сценарии со стартом в узле сетки
+        assert_eq!(split_by_grid(0.0, 1.5, 5.0), vec![(1.5, 1.5)]);
+        assert_eq!(split_by_grid(5.0, 7.0, 5.0), vec![(7.0, 2.0)]);
+        assert_eq!(split_by_grid(0.0, -1.5, 5.0), vec![(-1.5, -1.5)]);
+        assert_eq!(split_by_grid(5.0, 3.0, 5.0), vec![(3.0, -2.0)]);
+    }
+}
diff --git a/snake-game/src/startup.rs b/snake-game/src/startup.rs
index 3973af4..5177b1b 100644
--- a/snake-game/src/startup.rs
+++ b/snake-game/src/startup.rs
@@ -37,7 +37,7 @@ fn spawn_snake(commands: &mut Commands) {
                 vec2(HEAD_SIZE as f32, HEAD_SIZE as f32),
             ),
             Transform {
-                translation: vec3(0.0, 0.0, 1.0),
+                translation: vec3(0.0, 0.0, 0.0),
                 ..Default::default()
             },
         ))
@@ -48,7 +48,7 @@ fn spawn_snake(commands: &mut Commands) {
             vec2(HEAD_SIZE as f32 * 0.3, HEAD_SIZE as f32 * 0.3),
         ),
         Transform {
-            translation: vec3(HEAD_SIZE as f32 * -0.25, HEAD_SIZE as f32 * 0.25, 0.0),
+            translation: vec3(HEAD_SIZE as f32 * -0.25, HEAD_SIZE as f32 * 0.25, 1.0),
             ..Default::default()
         },
         ChildOf(head),
@@ -59,7 +59,7 @@ fn spawn_snake(commands: &mut Commands) {
             vec2(HEAD_SIZE as f32 * 0.2, HEAD_SIZE as f32 * 0.2),
         ),
         Transform {
-            translation: vec3(HEAD_SIZE as f32 * 0.25, HEAD_SIZE as f32 * 0.25, 0.0),
+            translation: vec3(HEAD_SIZE as f32 * 0.25, HEAD_SIZE as f32 * 0.25, 1.0),
             ..Default::default()
         },
         ChildOf(head),
@@ -93,6 +93,25 @@ fn spawn_snake(commands: &mut Commands) {
             commands.entity(event.0).remove::<ObservedBy>();
         },
     );
+
+    commands
+        .entity(tail)
+        //
+        .observe(
+            |event: On<GridBarier>,
+             mut query: Query<(&mut Direction, &Transform)>,
+             snake_path: Res<SnakePath>| {
+                trace!("first observer working");
+                if let Ok((mut direction, transform)) = query.get_mut(event.0) {
+                    if let Some(new_direction) = snake_path.pick(transform) {
+                        *direction = new_direction;
+                    }
+                }
+            },
+        )
+        .observe(|event: On<GridBarier>| {
+            trace!("second observer working");
+        });
 }
 
 /// Создать координатную сетку