diff --git a/json_generator.py b/json_generator.py
index 7904030..5779a8e 100644
--- a/json_generator.py
+++ b/json_generator.py
@@ -3,6 +3,18 @@ import random
 import project_constants as const
 
 
+# auxiliary function that returns random attribute values based on their type
+def _get_random_attribute_values(self, attr_type, grid_dimensions):
+    num_of_rows, num_of_columns = grid_dimensions
+
+    if attr_type == int:
+        # temporary solution
+        return random.randint(num_of_rows + num_of_columns, (2 * num_of_rows + num_of_columns))
+
+    else:
+        pass
+
+
 class JsonGenerator:
     grid = dict()
 
@@ -20,58 +32,69 @@ class JsonGenerator:
         self.grid["agent_starting_position"] = str(starting_row) + ',' + str(starting_column)
 
     # overwrites grid field with a new grid with randomized colors and mines
-    def generate_randomized_grid(self, dimensions):
+    def generate_randomized_grid(self, dimensions, mine_appearance_chance=0.25, predecessor_chance_decrease=0.25):
         # clearing grid field
         self.clear_tile_dictionary()
 
         # getting grid dimensions
         num_of_rows, num_of_columns = dimensions
 
+        tile_pool = []
+
         for i in range(num_of_rows):
             for j in range(num_of_columns):
+
                 # picking random values for tiles
                 random_tile_color = random.choice(const.STRUCT_TILE_COLORS)
-                random_mine_type = random.choice(const.STRUCT_MINE_TYPES)
 
-                # randomly checking if a mine should appear
-                if random.random() < 0.75:
-                    # creating a tile without a mine
-                    self.add_tile((i, j), random_tile_color)
+                # adding added tile's index to a pool
+                tile_pool.append((i, j))
 
-                else:
-                    # picking random mine attribute values
+                # adding the random tile
+                self.add_tile((i, j), random_tile_color)
+
+        # deleting tile agent's starting tile from the set
+        deleted_row, deleted_column = self.grid["agent_starting_position"].split(',')
+        tile_pool.remove((int(deleted_row), int(deleted_column)))
+
+        for i in range(num_of_rows):
+            for j in range(num_of_columns):
+
+                # checking if a mine will appear
+                if random.random() < mine_appearance_chance and len(tile_pool) > 0 and tile_pool.__contains__((i, j)):
+                    # removing current tile from the set
+                    tile_pool.remove((i, j))
+
+                    # choosing random mine parameters
+                    random_mine_type = random.choice(const.STRUCT_MINE_TYPES)
                     random_attribute_values = []
 
                     for attr_type in const.STRUCT_MINE_ATTRIBUTE_TYPES[random_mine_type]:
+                        random_attribute_values.append(_get_random_attribute_values(self, attr_type, dimensions))
 
-                        if attr_type == int:
-                            min_value, max_value = (num_of_columns + num_of_rows) / 2, 2 *(num_of_columns + num_of_rows)
-                            random_value = random.randint(min_value, max_value)
-                            random_attribute_values.append(random_value)
+                    # adding the mine
+                    self.set_a_mine((i, j), random_mine_type, random_attribute_values)
 
-                        elif attr_type == (int, int):
+                    # if is ChainedMine create predecessors
+                    if random_mine_type == "chained":
+                        predecessor_appearance_chance = 1.0
+                        current_tile = str(i) + ',' + str(j)
 
-                            if i > 0:
-                                rand_i = random.randint(0, (i - 1))
-                                rand_j = random.randint(0, (num_of_columns - 1))
-                                random_attribute_values.append(str(rand_i) + ',' + str(rand_j))
-                                self.set_a_mine((rand_i, rand_j), "chained", [None])
+                        # create chained predecessors
+                        while random.random() < predecessor_appearance_chance and len(tile_pool) > 0:
+                            predecessor_appearance_chance -= predecessor_chance_decrease
 
-                            elif j > 0:
-                                rand_i = 0
-                                rand_j = random.randint(0, (j - 1))
-                                random_attribute_values.append(str(rand_i) + ',' + str(rand_j))
-                                self.set_a_mine((rand_i, rand_j), "chained", [None])
+                            predecessor_position = random.choice(tile_pool)
+                            pre_row, pre_column = predecessor_position
+                            predecessor = str(pre_row) + ',' + str(pre_column)
+                            tile_pool.remove(predecessor_position)
 
-                            else:
-                                random_attribute_values.append(None)
+                            self.set_a_mine(predecessor_position, "chained", [])
 
-                    # creating a tile with a mine
-                    self.add_tile_with_a_mine(
-                        (i, j),
-                        random_tile_color,
-                        random_mine_type,
-                        random_attribute_values)
+                            self.grid[current_tile]["mine"]["predecessor"] = predecessor
+                            self.grid[predecessor]["mine"]["predecessor"] = None
+
+                            current_tile = predecessor
 
     # adds a new tile or edits an existing one in the grid field
     def add_tile(self, position, color):