Instructions: The objective is to create bridges using the minimum number of blocks. To reduce costs, you can merge smaller, more expensive blocks and swap them for larger, more cost-effective ones. Shifting Blocks: Drag and drop the blocks into the gaps on the bridge. Initially, you can only add blocks. Once you have enough smaller blocks, you can exchange them for a larger block. Block Swapping: Choose the blocks you wish to exchange and then press the "trade" button. The blocks you swap must be in the same row.