To win at Invaders from the Planet Moolah, focus on activating the Cascading Reels feature to create multiple winning combinations. Use the special wild symbols, known as Cows, to help complete winning lines. Aim to trigger the Free Spins bonus round by landing specific combinations on the reels. Take advantage of the re-trigger feature during the Free Spins round to extend your gameplay and increase your chances of winning. Pay attention to your bet size and adjust it according to your budget and playing style for optimal results. Remember, persistence and strategic gameplay are key to mastering Invaders from the Planet Moolah.