What is the difference between tower defence and 'auto-battle' games?

Tower defence involves player-placed defensive units that attack automatically. Auto-battle games (auto-chess, auto-battler) involve units that also move and position themselves. The player role is similar — preparation and strategic placement — but the execution phase is different. The genres are related and sometimes merged.

Are there cooperative tower defence games in browser?

Very few. Most browser tower defence games are single-player. The exception is some .io TD variants, which have small communities. Bramwell is unaware of a genuinely well-designed cooperative browser TD game as of 2025.

The Five Tower Defence Games That Respect Your Time

Tower defence is a genre that pairs badly with energy systems and pay-walls. The mechanic is about preparation and resource management over the course of a wave sequence — interrupting that with a monetisation event destroys the experience. Five games in this genre have not done that.

Bloons TD 5 — the complete flash archive version

Bloons Tower Defense 5 (Ninja Kiwi, 2012) is available in its complete form through Ninja Kiwi's own archive at ninjakiwi.com. The entire game, all tracks, all towers, all upgrades, with no energy system and no pay gate. The later Bloons TD 6 is a better game but is a Steam/mobile title with a price tag — the browser version is a limited demo. Bloons TD 5 browser is the complete article. Play time to content exhaustion: approximately thirty hours.

Kingdom Rush (first game, browser version)

Kingdom Rush (Ironhide Game Studio, 2011) is available in full on Armor Games. The original game — not Frontiers, not Vengeance, the first one — has eighteen missions and a complete difficulty ladder. The browser version is the full game. The sequels (Frontiers, Origins, Vengeance) are partially free-to-play in browser but gate later content. The original has no gate. It is possibly the best-designed tower defence game available for free anywhere.

GemCraft Chasing Shadows

GemCraft Chasing Shadows (Game in a Bottle) is the most mechanically complex tower defence game in the browser. Where Bloons and Kingdom Rush are accessible and well-produced, GemCraft is dense and demanding — a gem-crafting and tower-combination system that can occupy months of experimentation. The complete browser version is available at kongregate.com and gameinjabottle.com. No energy system. No mandatory advertising interruptions. This is the enthusiast tier of the genre.

Desktop Tower Defense

Desktop Tower Defense (Paul Preece, 2007) is the game that defined the genre before Bloons and Kingdom Rush arrived. The maze-building mechanic — towers as obstacles that redirect enemy paths, not just blocking units — is elegantly different from every TD game that came after. The original Flash version is now in Bluemaxima's Flashpoint archive. An HTML5 port exists at dtd.shockwave.com. Historically essential. Still mechanically interesting.

Infinitower

Infinitower (Nitrome, 2009) inverts the standard tower defence premise: you are building a tower upward, not defending a path. The game is a vertical construction puzzle with wave-interruption mechanics. It is more interesting design than most of what calls itself 'innovative' in the genre. Available in Nitrome's browser archive. Very short by genre standards — completable in ninety minutes — but those ninety minutes are worth them.