diff --git a/squirrelbattle/entities/friendly.py b/squirrelbattle/entities/friendly.py
index 365bdbc..9bdb3d0 100644
--- a/squirrelbattle/entities/friendly.py
+++ b/squirrelbattle/entities/friendly.py
@@ -11,7 +11,7 @@ class Merchant(FriendlyEntity) :
     inventory = list
     hazel = int
     
-    def keys(self) -> list :
+    def keys(self) -> list:
         """
         Returns a friendly entitie's specific attributes
         """
@@ -22,7 +22,7 @@ class Merchant(FriendlyEntity) :
         self.inventory = inventory
         self.hazel = hazel
 
-    def talk_to(self, player : Player) -> None:
+    def talk_to(self, player : Player) -> str:
         """
         This function is used to open the merchant's inventory in a menu,
         and allow the player to buy/sell objects
diff --git a/squirrelbattle/entities/player.py b/squirrelbattle/entities/player.py
index 900a3bd..46baacd 100644
--- a/squirrelbattle/entities/player.py
+++ b/squirrelbattle/entities/player.py
@@ -117,6 +117,12 @@ class Player(FightingEntity):
                 queue.append((new_y, new_x))
         self.paths = predecessors
 
+    def add_to_inventory(self, obj : Item) -> None :
+        """
+        Adds an object to inventory
+        """
+        self.inventory.append(obj)
+    
     def save_state(self) -> dict:
         """
         Saves the state of the entity into a dictionary
diff --git a/squirrelbattle/enums.py b/squirrelbattle/enums.py
index 17a4393..e563600 100644
--- a/squirrelbattle/enums.py
+++ b/squirrelbattle/enums.py
@@ -26,6 +26,7 @@ class GameMode(Enum):
     PLAY = auto()
     SETTINGS = auto()
     INVENTORY = auto()
+    STORE = auto()
 
 
 class KeyValues(Enum):
diff --git a/squirrelbattle/game.py b/squirrelbattle/game.py
index 62ec243..ec54dae 100644
--- a/squirrelbattle/game.py
+++ b/squirrelbattle/game.py
@@ -130,7 +130,8 @@ class Game:
                     if entity.is_friendly() and entity.x == xp and entity.y == yp :
                         msg = entity.talk_to(self.player)
                         self.logs.add_message(msg)
-                        
+                        if entity.is_merchant() :
+                            self.state = GameMode.STORE
                 
 
     def handle_key_pressed_main_menu(self, key: KeyValues) -> None:
diff --git a/squirrelbattle/interfaces.py b/squirrelbattle/interfaces.py
index db44675..c1f3078 100644
--- a/squirrelbattle/interfaces.py
+++ b/squirrelbattle/interfaces.py
@@ -329,6 +329,12 @@ class Entity:
         """
         return isinstance(self, FriendlyEntity)
 
+    def is_merchant(self) -> bool:
+        """
+        Is this entity a merchant?
+        """
+        return isinstance(self, Merchant)
+
     @property
     def translated_name(self) -> str:
         return _(self.name.replace("_", " "))
@@ -459,7 +465,7 @@ class FriendlyEntity(FightingEntity):
     """
     dialogue_option : list
 
-    def talk_to(self, player : Any) -> str:
+    def talk_to(self, player : Any) -> str :
         a = randint(0,len(self.dialogue_option)-1)
         return "The "+self.name+" said : "+self.dialogue_option[a]