Garden Gasworks

Connect three scattered gas pockets and reach the outlet with one continuous pipe. Save a valve for high-pressure water and avoid painting yourself into a corner. Tap an unused orthogonal neighbor to extend pipe. Five initial drill fuel; each step costs one, each gas pocket adds three. After two pockets, a water crossing causes two pollution and loses immediately without protection. Armed valve survives dry steps and is consumed only at water. The outlet requires all three pockets and must be reached to win. Old pipe cannot be revisited. Undo restores fuel, valve and pollution.