Sometimes if you play long enough,when you enter a level,there will be no enemies.no borok,visorak or vahki to attack.when this happens,to get hero mode,you must use your environment to get the pieces.don`t do this during a boss or sub-boss level or it will never end.the only 2 ways of fixing this is turning the game off,then on again or do any of the 3 bonus levels you have purchased during the game.then there will be enemies again.also there is no takua nuva in the game,he is only rumored in a collectable from a gold canister you collect during a level in the trophy cave.