Updated October 17, 2019: New entries!
The tower defence genre isn't anywhere near as popular as it used to be, with any big new releases few and far between.
Still, it remains a fun and mobile-friendly strategy sub genre with some downright classic games. What's more, you still see a little TD magic sprinkled across some of the popular hybrid genres of the moment.
One simple fact remains: no other type of strategy game feels as well suited to a compact touchscreen as tower defence. It's like it was invented for smartphones and tablets.
It wasn't, of course, but we sure are happy that it's taken up residence on our devices.
Here, then, are 25 of the best tower defence games available for iPhone and iPad.