diff --git a/server/services/store/game.go b/server/services/store/game.go
index 12210e8..fbb6541 100644
--- a/server/services/store/game.go
+++ b/server/services/store/game.go
@@ -178,6 +178,14 @@ func (gs *GameStore) GetMember(gameID, userID int) (*model.GameMember, error) {
 	return gameMembers[0], nil
 }
 
-// func (gs *GameStore) AddMember(gameID, userID int) (*model.GameMember, err) {
+func (gs *GameStore) AddMember(gameID, userID int, role string) (*model.GameMember, error) {
+	_, err := gs.Q().Insert("gamemembers").
+		Columns(gameMemberColumns...).
+		Values(gameID, userID, role).
+		Exec()
+	if err != nil {
+		return nil, fmt.Errorf("cannot insert gamemember: %w", err)
+	}
 
-// }
+	return gs.GetMember(gameID, userID)
+}
diff --git a/server/services/store/game_test.go b/server/services/store/game_test.go
index 506b09a..b08d255 100644
--- a/server/services/store/game_test.go
+++ b/server/services/store/game_test.go
@@ -43,4 +43,28 @@ func TestCreateGame(t *testing.T) {
 		require.Equal(t, user.ID, gameMember.UserID)
 		require.Equal(t, model.RoleGameMaster, gameMember.Role)
 	})
+
+	user2 := th.NewUser()
+	t.Run("should correctly add a new member as a player", func(t *testing.T) {
+		gameMember2, err := th.store.Game().AddMember(game.ID, user2.ID, model.RolePlayer)
+		require.NoError(t, err)
+		require.Equal(t, game.ID, gameMember2.GameID)
+		require.Equal(t, user2.ID, gameMember2.UserID)
+		require.Equal(t, model.RolePlayer, gameMember2.Role)
+	})
+
+	user3 := th.NewUser()
+	t.Run("should correctly add a new member as a game master", func(t *testing.T) {
+		gameMember3, err := th.store.Game().AddMember(game.ID, user3.ID, model.RoleGameMaster)
+		require.NoError(t, err)
+		require.Equal(t, game.ID, gameMember3.GameID)
+		require.Equal(t, user3.ID, gameMember3.UserID)
+		require.Equal(t, model.RoleGameMaster, gameMember3.Role)
+	})
+
+	t.Run("should correctly fetch all members for game", func(t *testing.T) {
+		gameMembers, err := th.store.Game().GetMembers(game.ID)
+		require.NoError(t, err)
+		require.Len(t, gameMembers, 3)
+	})
 }