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HALLOWEEN
Halloween event which will include limited items and various other things. Carnival will follow afterwards
Game guide
Castle Defender Guide: Unit merchants and what they sell
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About
OverviewCastle Defender is a tower-defense and building game where waves of enemies attack your castle and you must place and upgrade defensive units to hold them off as long as possible. It runs on both desktop and mobile. This guide covers how to get started, which units to buy, how to handle bosses, and how to survive deeper into the waves.
What is on this page
Contents
01
Unit merchants and what they sell
Table
In short
The Medieval Merchant is always available; the other merchants rotate in every 30 minutes, so check back regularly for stronger options.
The Medieval Merchant stocks five permanent units. Additional merchants — Dynasty, Empire, Steam, Magic, and Imperial — rotate on a 30-minute cycle, offering more powerful units. Prices below are for the base (level-one) version of each unit.
| Unit | Merchant | Base cost | Base DPS | Special ability |
|---|---|---|---|---|
| Archer | Medieval | $500 | 16.7 | None |
| Crossbow | Medieval | $1,500 | 33.3 | None |
| Cannon | Medieval | $5,000 | 100 | None |
| Ballista | Medieval | $15,000 | 315.8 | None |
| Bombard | Medieval | $40,000 | 342.9 | Splash-5 |
| Imperial Archer | Imperial | $6,000 | 82.4 | Pierce-1 |
| Legionary | Imperial | $12,000 | 200 | Pierce-1 |
| Kartouwe | Imperial | $40,000 | 529.4 | Splash-5 |
| Magic Archer | Magic | $15,000 | 125 | Pierce-3 |
| Sorcerer | Magic | $30,000 | 325 | Chain-3 |
| Arcane Cannon | Magic | $150,000 | 1,600 | Splash-5 |
| Rifle | Steam | $100,000 | 958.8 | Pierce-6 |
| Steam Cannon | Steam | $400,000 | 2,592.6 | Splash-7 |
| Flamethrower | Steam | $500,000 | 3,120 | Flame-10 |
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02
Wall and defense placement
TipsIn short
Walls absorb damage so your units can do their job.
Walls absorb damage while your units deal damage to enemies. Start with what you can afford and upgrade as coins allow.
Tips worth knowing
- A Wood Wall costs $50 and has 50 HP.
- A Stone Wall costs $100 and has 200 HP.
- A Basalt Wall costs $2,500 and has 1,000 HP.
- An Iron Gate costs $250 and has 200 HP.
- A Feudal Wall has 3,500 HP and costs $14,000, available from the rotating merchant shop.
- A Feudal Wall Top has 1,750 HP and costs $7,000.
03 Live and upcoming events
Events
Events running now or coming soon. They have fixed dates, so check them first.
Live now
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Upcoming
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THE CARNIVAL
[CURRENT DATE IS NOT ACCURATE] A massive update with the aim of heavily expanding the game, no release date yet. Keep i…
04
Boss waves and how to prepare
WarnIn short
Each boss is tied to a specific wave number and unlocks an achievement when defeated.
There are eight bosses in total. Each one is stronger than ordinary enemies and triggers an achievement when defeated.
Worth watching out for
Wolf Boss
pass wave 5.
Bonehound
pass wave 25.
Goblin Mech
pass wave 50.
Guardian
pass wave 75.
Fallen Angel
pass wave 100.
Giant Skeleton, Necromancer, and Armored Giant are also bosses with achievements.
05 Working codes
Codes
PENGUINPEEP
100 Gems
100 Gems
GONG
BULL
Bull
Bull
BLAZE
Community strategy ideas
CommunityThese ideas and tips come from people playing the game. Share your discoveries too!
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Castle Defender 🏰
Glossary
Glossary- Wave
- A single round of enemies that attacks your castle; defeating all of them ends the wave and starts the next one.
- DPS
- Damage per second — how much damage a unit deals on average every second, calculated from its damage and attack speed.
- Splash
- An ability that lets a unit's attack hit multiple enemies in an area at once.
- Pierce
- An ability that lets a projectile pass through multiple enemies.
- Free camera
- A camera mode activated by pressing Shift and P on desktop that lets you view the whole map from any angle.
- Rotating merchant
- One of several shops — Dynasty, Empire, Steam, Magic, or Imperial — that appears on a 30-minute cycle and offers units not sold by the permanent Medieval Merchant.
Common questions
FAQDo private servers cost anything?
No, private servers are free.
How many bosses are there?
There are eight bosses: Wolf Boss, Bonehound, Goblin Mech, Guardian, Fallen Angel, Giant Skeleton, Necromancer, and Armored Giant. Defeating each one unlocks an achievement.
Can I play on mobile?
Yes, the game supports both desktop and mobile. Console support is in development but not yet available.
How do I use free camera?
On desktop, press Shift and P to activate free camera mode.
Updated Oct 31, 2026
Game updates can change what is on this page. If you spot something, get in touch and let us know.
Game updates can change what is on this page. If you spot something, get in touch and let us know.
