Yah, with the right commands they can easily be replaced with FallingSand entities that look like a different block. If I am right, the command would go something like: //replace <blockUsed> FallingSand {BlockID:7}The design might be cool, but as the name "TNTRun" says, there is TnT under the blocks, requiring the blocks to be made out of gravel/sand :/ Maybe with some codeing it is able to be changed, but normally the maps are made of gravel/sand/red sand and TnT