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Place things, upgrade things, watch a wave break against them. The most satisfying genre for people who like being right in advance.
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Monkeys pop balloons along a fixed path, and the upgrade trees behind that sentence are deep enough to justify the reputation.
The entire tower defence shelf in one place, sorted by how many people are currently playing, none of it requiring an account.
Tower defence from the villain's side, defending your gems from heroes using demons, orcs and the undead.
Fly a helicopter, wall off territory with towers, then defend the shape you just drew from everybody else.
The 2007 original that turned maze building into a genre, played across a desktop with the icons still sitting on it.
Numbers-heavy tower defence with endless mode, research trees and the general energy of a very well-kept spreadsheet.
The one most people name as the best tower defence: four tower types, hero units and levels that reward replanning.
Factory building crossed with tower defence: conveyor belts feed the guns, and the guns hold the line while you fix the belts.
Chop wood, raise windmills, then defend them from players who would much rather take yours than build their own.
The studio behind Bloons, with a browser games shelf that still hosts the tower defence titles the genre was built on.
Roguelike tower defence where you lay the map down as you go, and every tile placed narrows the next decision.
Survival game about not freezing to death, in which the other players are the weather's most enthusiastic accomplices.
Base building with tameable pets, farming and raids, which is a lot of systems for something that loads instantly.
Match-three fused with tower defence, so every swap you make is also the wave you are currently surviving.
Gather resources by day, build a base, then watch the zombie wave test every wall you decided to skimp on.
One button, one detour. Press it as often as you like.