'Since its inception as an online PC game in the 2000s, the Fortress series has been a fan favorite, spawning sequels on a variety of platforms, including mobile. The latest addition, Fortress S, includes a story mode in which you can go on a journey to collect 29 different tanks, a battle mode for up to four players simultaneously, and a classic mode that retains the original turn-based actions. There's also a music player with classic BGM, including the Sky Map theme song, and ten different sorts of minigames to keep you pleasantly entertained.