A good tower defense strategy comes down to four habits: build on bends, spend your starting money right away, upgrade before you spread out, and mix towers with different jobs. Every tower defense game on Totally Science rewards those habits, from the neon roads of Canvas TD to the element match-ups in Elematter. Below, each tip is shown with real numbers from our games.
If you have never played the genre, here is the short version. Enemies walk along a path toward an exit, and the towers you place beside the path fire at them on their own.
Our Tower Defense Games Unblocked
Four of our games are true tower defense. Two more are defense games with a twist.
| Game | Type | Towers | Waves | Start | Phone play |
|---|---|---|---|---|---|
| Canvas TD | Tower defense | 4 turrets | Endless | $35, 10 lives | Partial |
| PoliGuard | Tower defense | 7 towers | Endless | 100 coins, 10 lives | No, needs mouse and keys |
| Hex Formation | Tower defense | 3 turrets | 10 | 100 cash, 10 lives | Partial |
| Elematter | Tower defense | 4 elements | 20 | 500 fragments, 13 lives | Partial |
| Unicorns Off My Lawn | Garden defense | 4 tools, no towers | Seasons | 50 coins | Yes |
| Missile Defense | Arcade defense | 3 cannons you aim | Endless | 6 cities | Yes |
All of these tower defense games unblocked on Totally Science are free and open source. You can find the first four on the strategy games page.
Tip 1: Find the Chokepoints
A chokepoint is a spot where enemies pass close to one tower for a long time. In these games, that almost always means a bend in the road.
A tower on a straight stretch sees each enemy for a moment. A tower tucked inside a curve can shoot at enemies on both sides of the turn. Hex Formation makes this very clear, because some hexagon cells touch two parts of the road at once, which doubles a turret’s shooting time.
Map shape matters as well. Canvas TD has three maps:
- Loopy curls inward, so turrets inside the curl cover several lanes.
- Backtrack folds back over itself, which suits long-range turrets placed between the passes.
- Dash is one straight line, so raw damage matters more than placement.
Tip 2: Spend Early and Watch Your Economy
Your income comes from kills, so towers that fire in wave one start paying you back right away.
Here is how each game handles the opening:
- Hex Formation: two Standard turrets cost exactly your starting 100 cash, and you can place them before pressing Start Game.
- PoliGuard: your 100 coins buy two Basic towers, which handle the early waves well.
- Canvas TD: two Lasers at $15 each fit inside your $35 budget.
- Elematter: waves 1 to 5 are mostly Earth enemies, so Fire towers, which hit Earth harder, earn their cost quickly.
Later waves pay more. In Canvas TD, a kill is worth as many dollars as the current wave number. In PoliGuard, a kill pays 10 coins plus 2 per wave. Surviving the early rounds cleanly sets up the rest of the run.
Calling Waves Early
Most of these games let you send the next wave before the timer runs out. Elematter gives bonus fragments for it, and in Canvas TD extra waves bring extra kills and cash. Only do it when nothing is getting through, though. Hex Formation’s page warns that stacking two waves can swamp turrets that were coping fine.
Tip 3: Upgrade Before You Spread Out
New players often fill the map with cheap towers and never upgrade any of them. That usually fails once enemy health starts climbing.
The numbers back this up. In Hex Formation, the first upgrade on a Standard turret costs 20, while a new Standard costs 50. In Canvas TD, creep health rises 30 percent every wave through wave 10, and a single heavily upgraded turret often outperforms several weak ones.
PoliGuard has a twist. Upgrades apply to every tower of that type, so sticking to two or three favorite types makes each purchase count many times over. Buying one of all seven types leaves every upgrade weak.
Selling is a last resort. Canvas TD and PoliGuard refund 70 percent of a tower’s price, and Elematter refunds 75 percent of what you spent on it.
Tip 4: Give Every Tower a Role
Towers do different jobs, and the best defenses mix them. Most of our games have the same four roles under different names.
Damage Dealers
These are your backbone. The Canvas TD Laser, the PoliGuard Basic tower and the Hex Formation Standard turret are cheap, steady and good for the opening.
Slowers
A slowing tower keeps enemies inside everyone else’s range for longer. Examples are the Canvas TD Tazer, the PoliGuard Ice tower and the Water tower in Elematter. Put them early on the path, right before your main damage. A slow tower at the very end of the road has nothing left to help.
Splash and Long Range
Splash towers, like the Canvas TD Mortar and the PoliGuard Explosive tower, shine in later waves when crowds bunch up. Long-range towers, like the PoliGuard Sniper, the Hex Formation Laser Beam and the Elematter Air tower, cover more road from a single spot. In PoliGuard you can right-click a tower to set Snipers to target the strongest enemy.
Two Defense Games That Play Differently
Unicorns Off My Lawn is not tower defense, but it uses the same kind of thinking. You move a leprechaun to protect flower beds from a clumsy herd of unicorns, and you spend coins on tools like Noise and Repel instead of towers.
Missile Defense has you aim every shot yourself. You pick a point in the sky and the closest loaded cannon fires a burst there. Planning still matters, since a cannon that gets hit stays broken for the rest of the game.
Practice Without Pressure
Tower defense runs can take a while, especially in endless games like Canvas TD and PoliGuard. Most of them have a pause button, so you can stop and plan whenever you need to. Hex Formation, with its ten fixed waves, is the easiest to finish in one sitting.
Canvas TD, PoliGuard and Hex Formation are drawn with the browser’s built-in canvas element, so they run in a normal tab with no plugin. If you play on a school laptop, our guide on how to play games on a school Chromebook covers full screen and controls. Want something for a small screen? See our list of unblocked games that work on phones.
When you are ready for a change of pace, go back to all 87 games on Totally Science and pick a new genre.
Frequently asked questions
What is the best tower defense strategy for beginners?
Spend your starting money on cheap damage towers placed on bends, then upgrade them before buying more. Add a slowing tower near the start of the road once you can afford it. Calling waves early only makes sense when your defense is clearly winning and nothing is leaking.
Should I upgrade towers or build new ones?
In most of our tower defense games, upgrading wins early. In Hex Formation, the first Standard upgrade costs 20 while a new turret costs 50. In Canvas TD, one well-upgraded turret often hits harder than a row of new ones. Build new towers when you need a different role.
Where can I play tower defense games unblocked?
Canvas TD, PoliGuard, Hex Formation and Elematter all run in a browser tab on our strategy games page, with nothing to install. They are open-source games hosted on our own site. Whether a page loads at school still depends on your network and your school's rules.
Which tower defense game is easiest to start with?
Hex Formation is a good first pick. It has only three turret types, ten fixed waves and a clear finish line, and it runs on clicks or taps. Elematter adds an element system, while Canvas TD and PoliGuard have endless waves that suit longer sessions.
