diff --git a/logic/exceptions.py b/logic/exceptions.py
new file mode 100644
index 0000000..560a7a5
--- /dev/null
+++ b/logic/exceptions.py
@@ -0,0 +1,2 @@
+class FieldNotWalkable(Exception):
+    pass
diff --git a/logic/field.py b/logic/field.py
index 5f4c7d6..0faa309 100644
--- a/logic/field.py
+++ b/logic/field.py
@@ -1,5 +1,7 @@
 import pygame
 
+from logic.exceptions import FieldNotWalkable
+
 
 class Field(pygame.sprite.Sprite):
     def __init__(self, texture_path, converted_texture, img, rect, row=0, column=0):
@@ -17,7 +19,10 @@ class Field(pygame.sprite.Sprite):
         if self.texture_path == 'water.png' or self.texture_path == 'grass_with_tree.jpg':
             self.busy = True
 
-    def step_onto(self, obj):  # ustawia objekt na srodku pola
-        obj.rect = obj.clamp(self.rect)
-        self.busy = True
-        obj.update()
+    def put_on(self, obj):  # ustawia objekt na srodku pola
+        if not self.busy:
+            obj.rect = obj.rect.clamp(self.rect)
+            self.busy = True
+            obj.update()
+        else:
+            raise FieldNotWalkable
diff --git a/logic/game.py b/logic/game.py
index 90621d4..436d514 100644
--- a/logic/game.py
+++ b/logic/game.py
@@ -117,6 +117,8 @@ class Game:
 
         castle_spawn.spawn()
 
+        #grid.put_on_tile(0, 0, knights_left[0])
+
         while running:
             self.screen.blit(self.bg, (0, 0))
 
diff --git a/logic/grid.py b/logic/grid.py
index ce1a675..8074713 100644
--- a/logic/grid.py
+++ b/logic/grid.py
@@ -4,6 +4,7 @@ import pygame
 
 from common.constants import ROWS, COLUMNS, GRID_CELL_PADDING, GRID_CELL_WIDTH, GRID_CELL_HEIGHT, BORDER_WIDTH, \
     BORDER_RADIUS, NBR_OF_TREES, NBR_OF_WATER
+from .exceptions import FieldNotWalkable
 from .field import Field
 
 
@@ -15,15 +16,15 @@ class Grid:
         self.busy_fields = []
         podkladka = np.zeros((ROWS, COLUMNS))
         for drzewa in range(0, NBR_OF_TREES):
-            rzad = random.randint(0, ROWS-1)
-            kolumna = random.randint(0, COLUMNS-1)
+            rzad = random.randint(0, ROWS - 1)
+            kolumna = random.randint(0, COLUMNS - 1)
             if podkladka[rzad][kolumna] == 0:
                 podkladka[rzad][kolumna] = 1
             else:
                 drzewa = drzewa - 1
         for i in range(0, NBR_OF_WATER):
-            rzad = random.randint(0, ROWS-1)
-            kolumna = random.randint(0, COLUMNS-1)
+            rzad = random.randint(0, ROWS - 1)
+            kolumna = random.randint(0, COLUMNS - 1)
             if podkladka[rzad][kolumna] == 0:
                 podkladka[rzad][kolumna] = 2
             else:
@@ -66,6 +67,15 @@ class Grid:
         texture_index = random.randint(0, len(self.textures) - 3)
         return self.textures[texture_index]
 
+    def get_tile(self, row, column):
+        return pygame.sprite.Group.sprites(self.grid[row][column])[0]  # iteruj kolumny i wiersze od 0
+
+    def put_on_tile(self, row, column, obj):  # iteruj kolumny i wiersze od 0
+        try:
+            self.get_tile(row, column).put_on(obj)
+        except FieldNotWalkable:
+            print("Field busy")
+
     def draw(self, screen):
         bg_width = (GRID_CELL_PADDING + GRID_CELL_WIDTH) * COLUMNS + BORDER_WIDTH
         bg_height = (GRID_CELL_PADDING + GRID_CELL_HEIGHT) * ROWS + BORDER_WIDTH