About Bloons Tower Defense 4
Bloons Tower Defense 4 (BTD4) is one of the most beloved and replayable entries in the long-running Bloons series, and this free browser version lets you play it instantly — no download, no account, no install. Your goal is simple: stop the colorful balloons, or "bloons," from escaping across the map before they reach the end. To do that you place a lineup of monkey towers along the path and upgrade them as the waves get tougher. Each tower plays a different role — some offer cheap early defense, others bring long-range power or area damage, and a few specialize in slowing or debuffing the bloons so your attackers can finish them off. Every tower has a deep upgrade tree, so a single game can play out very differently depending on which towers and upgrades you invest in. With multiple maps, a range of difficulty settings, and bonus challenge modes for veterans, BTD4 rewards planning and patience while staying easy to pick up. It is the perfect balance of accessible and strategic — a tower defense favorite that players have returned to for years.
Game details
How to play
Click Open Official Site, let the external game host load in a new tab, then follow the controls shown there. If the host is slow, return to ShouyouRadar and try another game from the same category.
Bloons TD 4 FAQ
Is Bloons TD 4 free to play?
Yes — this browser version is free to play with no install or purchase required.
What is the best starting tower in BTD4?
The Dart Monkey is cheap and reliable for early waves, so it is the safest first tower. Mix in a Sniper or Cannon later for stronger bloons.
Can I play Bloons TD 4 on mobile?
The browser version runs on desktop, mobile, and tablet browsers where the host site supports play, so you can enjoy it on the go.
How do I beat the harder rounds?
Plan tower placement so every section of the track is covered, then focus upgrades that match the main bloon types — for example, a Spike Factory near the end is a great safety net for leaking bloons.