Board Thread:Wiki Improvements/@comment-25767970-20141201203419

"The best way to complete the Steely achievement for BTD5M is to replay the random mission 'Chemical Warfare' repeatedly. "  How the hell can that even be done? Random Missions are chosen (surprise) randomly, from a pool of 250, none of which repeat till you reset to all 250 being available. So on average you can expect to play 125 Random Missions to get a single "Chemical Warfare". 