How to win at tower defense: corners, upgrades and gold between waves
In tower defense, enemies walk the same fixed path every time and you line that path with towers that shoot on their own. Three decisions win most maps: build where the path bends, upgrade a well-placed tower before buying a new one, and spend your gold before the next wave starts.
The basic rules of tower defense
Almost every game in the genre runs on the same skeleton:
- The path: enemies spawn at an entry point and follow a pre-drawn route toward your base, castle or treasure.
- Building: you click a marked empty spot next to the path to place a tower. Once built, it fires at anything inside its range without any input from you.
- Gold: every enemy you take down drops coins. That money pays for new towers, upgrades to existing ones, or spells.
- Waves: enemies arrive in groups, not one at a time. Each wave is bigger or tougher than the last.
- Lives: every enemy that reaches the end of the path costs you health. Run out and the level is lost; survive the final wave and the map is cleared.
In some games the towers fire automatically and your job is purely placement. In others you control a single tower and do the aiming yourself. Tower Defense and Cursed Treasure 1.5 belong to the first group. BowMaster Tower Attack and Kingdom Tower Defense are shooters: you pick the target with the mouse and click to fire. The placement advice below applies to the first group; the upgrade and gold advice applies to both.
Where to build: the corners
A tower's strength is not just its damage. How long an enemy stays inside its range counts just as much. A tower beside a straight stretch sees each passing enemy for a brief moment. A tower tucked inside a U-shaped bend hits the same enemy on the way in, around the turn and on the way out.
Picture this: the path enters on the left, makes a tight U in the middle of the screen and leaves on the right. You can afford two towers. Put one at the entrance and one at the exit, and each sees enemies for only a few steps. Put both inside the U, and each covers both arms of the path at once, firing for noticeably longer across the same wave.
Once you have found the bend, think about order. Tower Defense lets you combine towers and elements for separate effects such as slowing and area damage. Place the slowing tower at the start of the corner and the damage tower right behind it. Slowed enemies linger in the damage tower's range, so the pair does more than either would alone.
Many towers, or fewer upgraded ones?
In most games, maxing out a few towers on good spots beats scattering one tower across every corner of the map. A tower on a straight stretch barely sees the enemy, so the gold you spent on it earns little back. An upgrade on a corner tower boosts something that is already firing constantly.
Early on you will not have enough gold to upgrade anything, so you need two or three basic towers just to hold the line. A balanced plan:
- First wave: build one or two basic towers inside the first bend and keep the rest of your gold.
- Middle waves: upgrade those towers instead of adding new ones. When one tower clearly stops coping, add a second type next to it.
- When crowds or fast enemies show up: add area damage or a slow effect rather than stacking more single-target towers.
Cursed Treasure 1.5 is a good teacher here. Each tower type has its own damage and range, and the points you earn unlock permanent skills between maps.
Managing gold between waves
When you spend matters as much as what you buy. If you hoard coins after a wave and try to upgrade in the middle of the next one, the first enemies are already slipping through by the time the tower gets stronger. Do your upgrades in the quiet moment between waves, so the defense is ready when the next group arrives.
- After every wave, ask one question: where did enemies get through? Put the gold there.
- Before a boss or the final wave, keep a small reserve. An unexpectedly tough enemy can then be answered with an emergency upgrade.
- Do not waste spells on a single enemy. Most games put spells on a cooldown, so save them for the moment the crowd bunches up.
The same logic holds in the shooter games. In Kingdom Tower Defense the gold from fallen monsters goes into shot power, fire rate and new spells. Fortress Defense sends you to a shop after each mission, and what you buy there carries over to later levels. That is why archer damage should usually come before wall strength: extra durability only delays a wave, it never finishes it.
Common mistakes
- Stacking towers at the entrance. The spawn point is where enemies move fastest and in the tightest group; building before the first corner usually wastes gold.
- Filling the map with one tower type. When flying or shielded enemies show up, a one-note defense collapses. Retro Defenders makes this obvious: flying enemies ignore ground troops, so without a ranged fighter in your team the line breaks.
- Shooting where the enemy is, not where it will be. Arrows need time to travel, so aim ahead of the target.
- Repeating the same layout after a loss. A lost level usually comes down to one weak spot; moving a tower one bend further along is often enough.
Which game to practice with
For learning placement from scratch, Tower Defense is the cleanest start. The towers fire by themselves; you click an empty spot to build, then upgrade.
Cursed Treasure 1.5 follows the classic formula: line the path with towers and guard the last three gems you own. Because raiders try to grab a gem and run, it teaches you to keep a spell ready for the one who escapes.
In Retro Defenders you build a team from eight different fighters instead of towers. Melee fighters block the enemy while ranged ones hit from behind, which teaches you to think about the order of your defenders.
Fortress Defense is the long-haul option, with a hundred levels and five archer types. Freeze, poison and lightning bonuses let you practice slowing crowds down or hitting them all at once.
If you want to try the shooter side, there are three picks. Kingdom Tower Defense puts you in the role of a magic king firing at monsters marching on your castle. BowMaster Tower Attack teaches the piercing arrow, which takes out two enemies in a line with one shot. CatRobot Idle TD Battle Cat has you aim with a single tap, with bulkier bosses at the end of each level.
▶Kingdom Tower Defense - Free Tower Defense Game
▶BowMaster Tower Attack - Free Archer Tower Defense
▶CatRobot Idle TD Battle Cat - Free Tower DefenseLooking for defense mixed with attack? Evolution Era takes a different route: instead of building towers you buy fighters and send them down the lane, then save up to advance to the next age.
For more planning games beyond this genre, the strategy games guide and the strategy category are good next stops.
Frequently asked questions
Can I play tower defense games on my phone?
All eight games in this article support touch controls. In placement games you tap an empty spot to build a tower; in shooter games you tap and drag on the screen to aim.
Where should my first tower go?
On the inside of the first clear bend after the entrance. From there it sees enemies on both arms of the path and can usually handle the opening wave by itself.
Upgrade or build a new tower?
If the tower sits on a good spot, upgrade first. Build a new one when enemies start slipping through an area your current towers do not reach, or when you need a different effect, such as slowing.
I lost a level. Should I start over?
You can replay the level you lost. Look at where the enemies got through, then change only the layout around that spot; there is rarely any need to rebuild the whole plan.