diff --git a/worlds/grinch/Client.py b/worlds/grinch/Client.py
index 000805d2..1b57f57f 100644
--- a/worlds/grinch/Client.py
+++ b/worlds/grinch/Client.py
@@ -1,51 +1,112 @@
 from typing import TYPE_CHECKING
-
+from .Locations import grinch_locations
+from .Items import ALL_ITEMS_TABLE
 from NetUtils import ClientStatus
-
+import asyncio
 import worlds._bizhawk as bizhawk
 from worlds._bizhawk.client import BizHawkClient
 from worlds.Files import APDeltaPatch
 if TYPE_CHECKING:
     from worlds._bizhawk.context import BizHawkClientContext
+    from CommonClient import logger
 
 
 class GrinchClient(BizHawkClient):
     game = "The Grinch"
     system = "PSX"
     patch_suffix = ".apgrinch"
+    items_handling = 0b111
+
+    def __init__(self):
+        super().__init__()
 
     async def validate_rom(self, ctx: "BizHawkClientContext") -> bool:
+
         grinch_identifier_ram_address: int = 0x00928C
-        bytes_expected: bytes = bytes.fromhex("53554C533131305F3B37392E")
+        bytes_expected: bytes = bytes.fromhex("e903c14f4becf89082f43ec936a68e62")
         try:
             bytes_actual: bytes = (await bizhawk.read(ctx.bizhawk_ctx, [(
-                grinch_identifier_ram_address, len(bytes_expected), "MainRAM"
-            )]))[0]
+                grinch_identifier_ram_address, 11, "MainRAM")]))[0]
+
+            psx_rom_name = bytes_actual.decode("ascii")
+            if psx_rom_name != "SLUS_011.97":
+                logger.info("Invalid rom detected. You are not playing Grinch USA Version.")
+                raise Exception("Invalid rom detected. You are not playing Grinch USA Version.")
         except Exception():
-            return True
+            return False
+
+        ctx.game = self.game
+        ctx.items_handling = self.items_handling
+        ctx.want_slot_data = True
+        ctx.watcher_timeout = 0.5
+
+        return True
+
+    async def set_auth(self, ctx: "BizHawkClientContext") -> None:
+        await ctx.get_username()
 
     async def game_watcher(self, ctx: "BizHawkClientContext") -> None:
+        #If the player is not connected to an AP Server, or their connection was disconnected.
+        if ctx.server is None or ctx.server.socket.closed or ctx.slot_data is None:
+            return
+
+
         try:
-            # Read save data
-            save_data = await bizhawk.read(
-                ctx.bizhawk_ctx,
-                [(0x3000100, 20, "System Bus")]
-            )[0]
-
-            # Check locations
-            if save_data[2] & 0x04:
-                await ctx.send_msgs([{
-                    "cmd": "LocationChecks",
-                    "locations": [23]
-                }])
-
-            # Send game clear
-            if not ctx.finished_game and (save_data[5] & 0x01):
-                await ctx.send_msgs([{
-                    "cmd": "StatusUpdate",
-                    "status": ClientStatus.CLIENT_GOAL
-                }])
+            # # Read save data
+            # save_data = await bizhawk.read(
+            #     ctx.bizhawk_ctx,
+            #     [(0x3000100, 20, "System Bus")]
+            # )[0]
+            #
+            # # Check locations
+            # if save_data[2] & 0x04:
+            #     await ctx.send_msgs([{
+            #         "cmd": "LocationChecks",
+            #         "locations": [23]
+            #     }])
+            #
+            # # Send game clear
+            # if not ctx.finished_game and (save_data[5] & 0x01):
+            #     await ctx.send_msgs([{
+            #         "cmd": "StatusUpdate",
+            #         "status": ClientStatus.CLIENT_GOAL
+            #     }])
+            await self.location_checker(ctx)
+            # await self.receiving_items_handler(ctx)
 
         except bizhawk.RequestFailedError:
             # The connector didn't respond. Exit handler and return to main loop to reconnect
-            pass
\ No newline at end of file
+            pass
+
+    async def location_checker(self, ctx: "BizHawkClientContext"):
+        # TODO Write a function to check if I am ingame, determine how I am playing the game vs not in demo mode/game menu
+        # Update the AP Server to know what locations are not checked yet.
+        for missing_location in ctx.missing_locations:
+            local_location = ctx.location_names.lookup_in_game(missing_location)
+            # Missing location is the AP ID & we need to convert it back to a location name within our game.
+            # Using the location name, we can then get the Grinch ram data from there.
+            grinch_loc_ram_data = grinch_locations[local_location]
+
+            # Grinch ram data may have more than one address to update, so we are going to loop through all addresses in a location
+            for addr_to_update in grinch_loc_ram_data.update_ram_addr:
+                is_binary = True if not addr_to_update.binary_bit_pos is None else False
+                current_ram_address_value = int.from_bytes((await bizhawk.read(ctx.bizhawk_ctx, [(
+                    addr_to_update.ram_address, addr_to_update.bit_size, "MainRAM")]))[0])
+                if is_binary:
+                    if (current_ram_address_value & (1 << addr_to_update.binary_bit_pos)) > 0:
+                        ctx.locations_checked.add(missing_location)
+                else:
+                    expected_int_value = addr_to_update.value
+                    if expected_int_value == current_ram_address_value:
+                        ctx.locations_checked.add(missing_location)
+
+        # Update the AP server with the locally checked list of locations (In other words, locations I found in Grinch)
+        await ctx.check_locations(ctx.locations_checked)
+
+    async def receiving_items_handler(self, ctx: "BizHawkClientContext"):
+        for item_received in ctx.items_received:
+            local_item = ctx.item_names.lookup_in_game(item_received)
+            grinch_item_ram_data = ALL_ITEMS_TABLE[local_item]
+
+            for addr_to_update in grinch_item_ram_data.update_ram_addr:
+                is_binary = True if not addr_to_update.binary_bit_pos is None else False
\ No newline at end of file
diff --git a/worlds/grinch/__init__.py b/worlds/grinch/__init__.py
index e5439bb9..b24251b9 100644
--- a/worlds/grinch/__init__.py
+++ b/worlds/grinch/__init__.py
@@ -4,6 +4,7 @@ from .Items import grinch_items_to_id, GrinchItem, ALL_ITEMS_TABLE, MISC_ITEMS_T
 from .Regions import connect_regions
 from .Rules import set_rules
 
+from .Client import *
 from typing import ClassVar
 
 from worlds.AutoWorld import World