There aren't as many brand new tower defence games landing on the Android these days. And we find that a bit of a shame, because this is the one strategy sub-genre that feels like it really belongs on mobile.
Don't worry, though, TD fans. There are still loads of brilliant tower defence games available on the Google Play Store. Even if some of them are a little old, you can't have played them all, right?
And besides, there are still new TD games being made. They just might look a little different to the genre's hey day, and they probably don't generate as much attention as they used to.
With the newer additions to the list, we find tower defence getting spliced into other, more casual genres. The result is some intriguing hybrid efforts.
Kingdom Rush, along with its three follow-ups, is the pinnacle of tower defence. It's all thanks to a near-perfect combination of tight unit balance, intuitive controls, inventive and challenging level design, and a knock-out comic book aesthetic.
Bad North is a unique combination of real-time strategy and roguelike, but it's the distinct tower defence flavour we're interested in. Develop and position your troops to defend a series of besieged islands.
You might think of tower defence as an inherently limiting genre, applying a rigid framework to the strategy framework. But Dungeon Warfare 2 is a sprawling effort that has you constructing complete deadly dungeons.
If there's another series that has come to define mobile TD as much as Kingdom Rush, it's Fieldrunners. This second iteration takes the classic tower defence template and stretches it out as far as it can go in terms of variety, polish, and sheer volume of content.
You'd think we'd be tired of the Kingdom Rush formula by now, but we're not. This fourth slice of classic TD flips the script and places you in control of the original's big bad and his demonic forces.
'More of the same' is often a negative description. When it comes to the Kingdom Rush series, though, it's a ringing endorsement. A new setting, fresh towers, original heroes - same peerless TD gameplay.
Fieldrunners was superseded in pretty much every way by its sequel, but the original Fieldrunners is still one of the best TD games around. It's the original mobile TD hit, often copied, rarely bested.
Tiny Defense 2, like its predecessor, flips the TD template around to a side-on perspective and makes everything look like a 16-bit mascot platformer. The result is one of the more welcoming TD games of recent times.
Like Royal Revolt, the Anomaly games turn TD on its head. Here you're in direct control of the attacking swarm that's running the gauntlet through your enemy's static defences. The resulting fireworks are spectacular.
Sentinel 4 took years to arrive after the influential Sentinel 3, and it feels suitably out of time. Packed full of systems and lacking much in the way of hand-holding, its old school TD approach is oddly refreshing.
Anomaly Defenders reverses the course of the earlier Anomaly games - which, as it turns out, brings it into sync with the other TD games on this list. It's a particularly pretty and nuanced example of the form, though.
An early example of the tower defence genre being chopped and spliced with other genres. CastleStorm has Angry Birds-like pinging, direct hack-and-slash action and more - and it all holds together very well indeed.
The Dead Island brand name is here put towards a surprising mixture of TD strategy and hack-and-slash combat. It's not the subtlest slice of strategy on this list, but defending a band of survivors from waves of the undead is sure to put a grim smile on your face.
Arknights casts you as a representative of a pharmaceutical company that fights both a deadly infection and the unrest it leaves in its wake. Add some sharp anime-style interstitial scenes, and you have a uniquely flavoured TD game.