HomepageptrPopular puzzles created by ptr Popular puzzles created by ptr 20heat and power plant chimneysptrsolved 14 timesSolve puzzle 20curb cuttingptrsolved 7 timesSolve puzzle20clearanceptrsolved 6 timesSolve puzzle36aggregatesptrsolved 5 timesSolve puzzle165low emissionsptrsolved 5 timesSolve puzzle132dust in the millptrsolved 5 timesSolve puzzle165smoke from the chimneyptrsolved 4 timesSolve puzzle 180mold sporesptrsolved 4 timesSolve puzzle