Book excerpt: Master Builder Power Up! Level 2 is perfect for MinecraftTM players with a basic knowledge of Redstone who are looking to increase their skills. Starting with an easy-to-understand explanation of Redstone gates and automation, Level 2 concludes with step-by-step instructions for intermediate builds that will test your skills and amaze your friends. Try your hand at building automatic double doors, a combination lock, a TNT cannon, and more in this intermediate guide to Redstone.