Clash of Clans is probably the best online strategy game that you can download to your phone.
The purpose of which is not even to create, but also to tactically correctly place traps, fences, watchtowers, guns and most importantly the town hall / builder's house There are two maps, the classic "native village" and "builder's village". To be honest, with the latest update, I like the first one better. Also, after a major update, the clan capital was added, where raids are held every week from Friday to Sunday inclusive, an excellent addition to the game, where all clan members contribute to the development of seven regions (at the moment).