If you want to beat the game on Insane Difficulty but are having trouble, try the following. Start each chapter on Casual Difficulty after having unlocked Insane Difficulty. Then, before reaching the final checkpoint on any given chapter, switch the difficulty over from Casual to Insane. Then, finish the chapter. The game will record that you\'ve completed that particular chapter on Insane Difficulty, even though you played a vast majority of the chapter on Casual Difficulty.