Play
Tower Defence
Place things, upgrade things, watch a wave break against them. The most satisfying genre for people who like being right in advance.
15 sites
Monkeys pop balloons along a fixed path, and the upgrade trees behind that sentence are deep enough to justify the reputation.
- 10 min
- Desktop
The entire tower defence shelf in one place, sorted by how many people are currently playing, none of it requiring an account.
- 10 min
Tower defence from the villain's side, defending your gems from heroes using demons, orcs and the undead.
- 10 min
- Desktop
Fly a helicopter, wall off territory with towers, then defend the shape you just drew from everybody else.
- 10 min
- Desktop
The 2007 original that turned maze building into a genre, played across a desktop with the icons still sitting on it.
- 10 min
- Desktop
Numbers-heavy tower defence with endless mode, research trees and the general energy of a very well-kept spreadsheet.
- 1 hr+
- Desktop
The one most people name as the best tower defence: four tower types, hero units and levels that reward replanning.
- 10 min
- Desktop
Factory building crossed with tower defence: conveyor belts feed the guns, and the guns hold the line while you fix the belts.
- 1 hr+
- Desktop
Chop wood, raise windmills, then defend them from players who would much rather take yours than build their own.
- 10 min
- Desktop
The studio behind Bloons, with a browser games shelf that still hosts the tower defence titles the genre was built on.
- 10 min
- Desktop
Roguelike tower defence where you lay the map down as you go, and every tile placed narrows the next decision.
- 10 min
- Desktop
Survival game about not freezing to death, in which the other players are the weather's most enthusiastic accomplices.
- 10 min
- Desktop
Base building with tameable pets, farming and raids, which is a lot of systems for something that loads instantly.
- 10 min
- Desktop
Match-three fused with tower defence, so every swap you make is also the wave you are currently surviving.
- 10 min
Gather resources by day, build a base, then watch the zombie wave test every wall you decided to skimp on.
- 10 min
- Desktop
How we picked these
Every entry in Detour is hand-sorted rather than scraped: filed under one category, given one to three moods, and placed in a time band for how quickly it pays off. The practical facts — cost, sign-up, sound, device and whether it is safe at a desk — are recorded per site and shown on every card, so you can rule things out before you click.
Tower Defence: questions
How many sites are in Tower Defence?
15 sites, each hand-sorted by category, mood and how long it takes to pay off.
Which of these sites are free with no sign-up?
15 of the 15 are free and need no account. None of them are paid.
Do these sites work on a phone, and are they safe for work?
2 of 15 work on a phone; the rest are desktop only. 15 are safe for work and 15 work with the sound off.