diff --git a/src/Game.hs b/src/Game.hs
index 2b9cb47..2904580 100644
--- a/src/Game.hs
+++ b/src/Game.hs
@@ -28,13 +28,9 @@ import qualified Hanafuda.Player (Player(..), Players(..))
 import qualified Hanafuda.KoiKoi (Action(..), Game(..), Environment, Mode(..), Move(..), Score, Source(..), Step(..), Yaku(..), new, play)
 import GHC.Generics
 
-deriving instance Generic Hanafuda.Card
 deriving instance Generic Hanafuda.Flower
-deriving instance Generic Hanafuda.KoiKoi.Action
 deriving instance Generic Hanafuda.KoiKoi.Mode
-deriving instance Generic Hanafuda.KoiKoi.Move
 deriving instance Generic Hanafuda.KoiKoi.Yaku
-deriving instance Generic Hanafuda.KoiKoi.Source
 deriving instance Generic Hanafuda.KoiKoi.Step
 deriving instance Generic1 (Hanafuda.Player.Player Player.Key)
 deriving instance Generic1 (Hanafuda.Player.Players Player.Key)
@@ -46,26 +42,14 @@ deriving instance Generic T
 instance ToJSON T where
   toEncoding = genericToEncoding JSON.defaultOptions
 
-instance FromJSON Hanafuda.Card
-instance ToJSON Hanafuda.Card
-
 instance ToJSON Hanafuda.Flower
 
 instance ToJSON Hanafuda.Pack where
   toJSON = toJSON . Hanafuda.cardsOfPack
   toEncoding = toEncoding . Hanafuda.cardsOfPack
 
-instance ToJSON Hanafuda.KoiKoi.Action
-
 instance ToJSON Hanafuda.KoiKoi.Mode
 
-instance FromJSON Hanafuda.KoiKoi.Move where
-  parseJSON = genericParseJSON JSON.singleLCField
-instance ToJSON Hanafuda.KoiKoi.Move where
-  toEncoding = genericToEncoding JSON.singleLCField
-
-instance ToJSON Hanafuda.KoiKoi.Source
-
 instance ToJSON Hanafuda.KoiKoi.Step where
   toEncoding = genericToEncoding JSON.defaultOptions
 
diff --git a/src/Message.hs b/src/Message.hs
index 5ef1771..1720ef0 100644
--- a/src/Message.hs
+++ b/src/Message.hs
@@ -30,33 +30,6 @@ import qualified App (Context(..), T, connection, debug, server)
 import qualified Hanafuda.KoiKoi as KoiKoi (Action, Game(..), Move(..))
 import GHC.Generics (Generic)
 
-data FromClient =
-    Answer {accept :: Bool}
-  | Invitation {to :: Player.Key}
-  | LogIn {name :: Text}
-  | LogOut
-  | Play {move :: KoiKoi.Move}
-  | Quit
-  | Ping
-  deriving (Generic)
-
-instance ToJSON FromClient where
-  toEncoding = genericToEncoding defaultOptions
-instance FromJSON FromClient where
-  parseJSON = genericParseJSON defaultOptions
-
-data T =
-    Relay {from :: Player.Key, message :: FromClient}
-  | Welcome {room :: Server.T, key :: Player.Key}
-  | Update {alone :: [Player.Key], paired :: [Player.Key]}
-  | Game {game :: Value, logs :: [KoiKoi.Action]}
-  | Pong
-  | Error {error :: String}
-  deriving (Generic)
-
-instance ToJSON T where
-  toEncoding = genericToEncoding defaultOptions
-
 sendTo :: [Player.Key] -> T -> App.T ()
 sendTo playerKeys obj = do
   sessions <- getSessions <$> App.server