How to Beat Primary Only on Dark Castle
#bloons td 6, #bloons td 6 strategy, #bloons tower defense 6, #BTD6, #btd6 Dark Castle, #btd6 Dark Castle Primary Only, #btd6 guide, #btd6 Primary Only, #btd6 strategy, #Dark Castle, #Dark Castle Primary Only, #Dark Castle strategy, #how to beat Dark Castle, #how to beat Primary Only, #how to beat Primary Only Dark Castle, #Primary Only