Pick a hero, then line a winding path with six tower types and hold off 15+ waves that keep getting nastier. It's a full tower defense game drawn entirely in canvas, with all the sound made on the fly.
About Tower Siege
A proper, meaty tower defense game, Tower Siege is a nice change of pace from all the puzzles and runners already sitting on 360 PlayZone. First you pick one of three heroes: a tanky knight, a long-range archer, or an area-blasting mage. Then you choose a difficulty, anywhere from Easy up to Nightmare, and start defending your base by lining the path with gunners, frost towers, snipers, cannons, lasers and barracks. The enemies won't let you settle into one strategy. Fast runners, armored tanks, fliers that float right over your ground blockers, healers, the odd boss, each kind forces you to rethink. You can upgrade and sell towers mid-fight, drop a Rain of Fire or call in reinforcements when a wave is about to break through, and a flawless run earns up to three stars. Everything's painted on a single canvas and every sound is synthesized in the browser, so it runs completely offline with nothing to download. Open-source game by sp-brj, used under the MIT license.
Inside Tower Siege: what we checked
The numbers below come from Tower Siege's own source code, and the screenshots are from our own test run of the game (20 October 2026).
- Difficulty sets your starting money, lives and how many waves you must survive: Easy is 300 gold, 30 lives and 15 waves; Normal 200, 20 and 20; Hard 150, 15 and 25; Nightmare 100, 10 and 30. Kills also pay out less on the harder settings.
- Wave n sends 5 + 2n enemies, and every enemy is 15% tougher per wave than in wave 1. Fast Runners join from wave 2, armoured Tanks from wave 4, Flyers from wave 5 that cross in a straight line, and Healers from wave 7. A Boss with 2,000 base health arrives on every fifth wave.
- Every enemy that reaches the end costs exactly 1 life, including a Boss, so letting a single Boss through is no worse than letting a single Grunt through.
- Towers can be upgraded twice. The first upgrade costs 60% of the tower's price and the second 80%, and each adds 30% damage and range. Selling returns 60% of everything you spent on that tower.
- Two abilities have cooldowns: Rain of Fire on Q (30 seconds) and Reinforcements on W (45 seconds, three soldiers for 15 seconds). Press the key, then click where you want it.
- You pick a Knight, Archer or Mage hero, who levels up to level 5 from kills and comes back after 8, 6 or 10 seconds if beaten. The top 10 scores are kept in this browser.
Unblocked Chromebook No Download Mobile Classic Quick Games
How to play Tower Siege
Tap PLAY, choose a hero, then a difficulty. From the bottom bar, select a tower and tap an open patch of ground (off the path) to build it there. Keep the enemies from reaching the end of the road and draining your lives. Beating enemies pays you money, so spend it on more towers or stronger ones, and clear every wave to win.
Controls
Desktop: left-click to place a tower or aim an ability, right-click to move your hero or open a tower's upgrade menu, keys 1-6 to pick a tower, Q/W for abilities, Space to start a wave, Esc to pause. Mobile: tap to place towers and use abilities; long-press the map to move your hero or open the upgrade menu.
Tips & tricks
- Plug your towers into the path's tight S-bends and corners so enemies stay in range longer.
- Frost towers don't kill fast, but slowing a pack lets every other tower get extra shots in.
- Use your hero as a mobile roadblock at chokepoints, then pull them back to heal before they fall.
- Save Rain of Fire and Reinforcements for boss waves or moments when enemies are about to leak through.
Frequently asked questions
Does Tower Siege save my progress?
Yes — Tower Siege keeps your best score and settings in this browser's local storage, so they are still there when you come back on the same device. Nothing is uploaded and no account is involved — clearing your browser data is what resets it.
Is Tower Siege unblocked at school or work?
Tower Siege is a plain web page of about 44303 KB — no plugin, no installer, no app store — so it loads on a Chromebook or a locked-down school or office laptop the same way any other page does, and the whole game arrives in one short download. Whether it opens comes down to your network's filter rather than the game itself.
Who made Tower Siege?
Tower Siege is a free browser edition of a well-known classic, rebuilt with modern web technology so it runs anywhere.