Is Bloons Tower Defense unblocked at school?

Yes. Bloons Tower Defense runs in a normal browser tab from bloonstowerdefense.org with nothing to install, so it plays on most school Chromebooks. If a network filter blocks the site, only that network's administrator can change it.

How do you play Bloons Tower Defense?

Pick a track and a difficulty, click a tower in the Buy Stuff panel and click on the grass beside the path to place it, then press Start Round. Towers pop the bloons on their own; every pop earns money for more towers and upgrades. Every bloon that reaches the end costs lives.

Which Bloons Tower Defense is this?

Bloons Tower Defense 3, the 2008 game with eight tracks and eight towers — the same one the old version of this site had on its front page. Bloons TD 1, 2 and 4 each have their own page here.

How can a Flash game still run?

Through Ruffle, an open-source Flash Player emulator written in Rust and WebAssembly. The page loads Ruffle and the original game file together; nothing is installed.

What is the difference between Easy and Hard?

Both start with 650 money. Easy gives you 100 lives and the lowest prices (Dart Monkey 215); Hard gives you 50 lives and higher prices (Dart Monkey 270).

Why is my tower circle red?

The spot is not allowed — it is on the path, too close to it, or on top of another tower. Move the mouse until the circle turns grey and click again, or press Esc to cancel.

Bloons Tower Defense Unblocked

This is Bloons Tower Defense unblocked: the original Bloons TD 3 Flash file runs above on Ruffle, served from bloonstowerdefense.org itself, so it plays in an ordinary browser tab on a school Chromebook, laptop or phone — free, with no download and no account.

Bloons Tower Defense 3: the one with the Monkey Beacon, the glue and the pineapples

Bloons Tower Defense 3 is the third game in Ninja Kiwi's series, from 2008, and the one where it stopped being a one-map game. After a short intro — a stone slab with III carved into it — the Select a Track screen offers eight tracks: a sandy trail that coils across a lawn, a brown dirt maze, a glowing blue circuit, a snowy run of grey pipes, a round green circuit board, and three more. Every one of them is a single path that the bloons follow from where they enter to where they leave.

Then you pick Easy, Med or Hard. On Easy you start with 650 money and 100 lives and the towers are cheap — a Dart Monkey costs 215. On Hard you start with the same 650 but only 50 lives, and the same Dart Monkey costs 270. Every bloon that gets through takes lives away, and the tougher colours take more than one because every layer inside them counts. The round number and difficulty sit in the top-left corner of the track so you always know where you are.

The Buy Stuff panel on the right holds eleven things. Eight are towers that stay put: Dart Monkey, Tack Shooter, Boomerang, Spike-o-pult, Cannon, Ice Ball, Monkey Beacon and Super Monkey. Three are one-round helpers you drop on the track itself: Road Spikes, Monkey Glue and the Pineapple. The panel shows each item's price and what it does before you buy, and placing works the same for all of them — click the icon, move to a free spot, click again.

Controls & mechanics

Action	Control	Purpose
Pick a track	Click one of the eight tiles	Then Easy, Med or Hard, or Cancel to pick again
Buy a tower	Click it in Buy Stuff, then click on the grass	The circle is its range; red means the spot is on the path or too close to it
Cancel a purchase	Esc	Or the Cancel Buy button that replaces the description while you hold a tower
Send the bloons	Start Round (bottom right)	Comes back when the round is cleared
Upgrade or sell	Click a placed tower	Shows its upgrades and the sell button
Sound / quit	Speaker icon (top) · End Game (bottom left)	End Game quits the game in progress

How to get further in Bloons Tower Defense 3

Learn a track on Easy first: Easy gives you 100 lives and the cheapest prices. Use it to find the corners where the path doubles back — those are where towers see bloons longest — then take the same plan to Hard, where you only get 50 lives.
Spend the whole 650 before round 1: Two Dart Monkeys on the inside of the first bends do more than one tower and money in the corner. Money sitting in the panel pops nothing.
Keep something sharp away from the ice: The Ice Ball freezes bloons, and frozen bloons are immune to anything sharp — darts, tacks, boomerangs, spikes. Put the Ice Ball next to a Cannon, whose bombs break the ice, not in the middle of your dart monkeys.
Use the one-round items on bad rounds: Road Spikes (25 on Easy) pop 10 bloons, Monkey Glue (30) slows 20, and a Pineapple (20) blows up shortly after you place it. They vanish at the end of the round, so save them for the round that would otherwise leak.
Build around the Monkey Beacon: The Beacon (850) attacks nothing, but everything inside its area gets more range, and its upgrade adds attack speed. Cluster your best towers around one instead of spreading them over the map.
Upgrade before you spread out: Piercing darts on a well-placed Dart Monkey beat a second unupgraded one. Spend on the towers already on good corners before you fill the lawn.

Key features

The original BTD3: Ninja Kiwi's 2008 Bloons Tower Defense 3 in its original Flash file, played through Ruffle.
Eight tracks: From a sandy lawn trail to a circuit board and a snowy pipe run, each chosen on the Select a Track screen.
Three difficulties: Easy: 100 lives and cheap towers. Hard: 50 lives and every price higher.
Eleven things to buy: Eight towers from the 215 Dart Monkey to the 3400 Super Monkey, plus road spikes, glue and pineapples.
The rest of the series: Bloons TD 1, 2 and 4, the BTD4 Expansion and the first Bloons dart game are on this site too.
Mouse only: No keys needed except Esc to cancel, so it plays the same on a Chromebook trackpad as with a mouse.

Game info

Title: Bloons Tower Defense 3
Developer: Ninja Kiwi
Category: Bloons TD
Platform: Web browser (HTML5)
Developer: Ninja Kiwi · Bloons Tower Defense 3 (2008) · original Flash file on Ruffle, served from bloonstowerdefense.org

Pro tip: Frozen bloons ignore everything sharp. If your Ice Ball sits among Dart Monkeys and Tack Shooters, it is protecting the bloons, not you — pair it with a Cannon.