-Use Turbo-mode (Shift-click the green flag) for quicker generating. -Click the green flag to generate a world. -Press 's' to show a world's seed, then copy it, and press 's' again to hide it. -Press space to enter a seed -Press the right arrow key to go through the different 12 blocks, and press the left arrow to go backwards through them. -The variable is the selected block. -Post your seeds in the comments! -Click to mine or place a block.
