Tip Wiki Guide

Castle TD Hints

Here are some great Castle TD hints. This game can be very difficult and if you spend crystals on the wrong things. Some stages are impossible to win without farming crystals.

These Castle TD hints will help you from having to start over or spending real money on crystals.

Visit our Castle Defense Wiki Guide for more info.


Farming – A good way to farm crystals is to make it to the last wave in a level that has not been completed and die. You will receive more crystals than if you completed the level and replayed it or dying on the last wave of the same completed level.

The more waves you complete before loosing, the more crystals you get. (Example: If I play level 14-3 and die on the 12th wave without ever completing the level I will get over 500 crystals every time. But if I complete level 14-3 and then replay it I will only receive 159 crystals). Farming crystals on Missions this way yields twice as many crystals, around 1000. The easiest way to loose the last wave is to sell your towers.


Devil Observer – You can prevent this enemy from summoning skeletons with it’s special attack by using Freeze right after its starts to summon or by placing warriors in it’s path.

Orc General – You can prevent this enemy from stunning near by towers by using Freeze right after its starts to use it’s special attack or by placing warriors in it’s path. You can “unstun” towers that were stunned by constantly clicking on them (that’s why they are signed with a “Tab”).


When starting in normal mode it’s a good idea to max turret upgrades at lvl 3 (must be in Hard mode to upgrade further) before spending crystals to increase there power.

Bunker – These are a waste because of how often they miss and there weak damage. I wouldn’t spend crystals in this until later in the game when your going for Architecture Research and Missions.

Lab – It’s best to just max upgrade level at first. Labs don’t do that much damage so spending your crystals on towers that do more DPS will help you kill faster sooner. The slow function is very useful for big enemies and bosses. The Avengers upgrade which lowers enemy defense is sometimes a must on boss levels.

Fort – You’ll use these towers the most and it’s a good idea to increase there attack power with crystals first before other towers.


I haven’t invested anything in warriors yet. In some stages however there are warriors there to help. On stages 4-1, 4-2, and 4-3 on Hard you get to play with each. Out of those stages the Wizard was the most effective because they can attack flying enemies.

Wizard – Has ranged and melee attacks. Can damage flying enemies and stop them temporarily with skill. Skill prevents enemies from moving or attacking. Would recommend taking for first play through as being able to attack air units makes them much more useful.

Paladin – Good attack damage. Special attack will heal your Paladin’s health over time.

Barbarian – High attack damage. Special attack increases damage dealt.

Placement – A good place to summon warriors is in the spot with the greatest concentration of fire. Stopped enemies can take much more damage increasing the life, duration, and overall effectiveness of your warriors.


I haven’t spent any crystals on props and doing so is kind of a risky move. If you loose, you will have wasted your crystals that would have been better spent on skills, towers, and warriors. You can retry with props by pausing the game before you loose and then using a task killer to close Castle TD. This game is difficult enough without spending crystals on props. If you do, you might end up having to farm more later.

Normal Mode

These are the things I spent crystals on that enabled me to beat normal mode. I did very little crystal farming and spent $0.


  • Max Mana 4
  • Mana Recovery 9
  • Max Life 1


  • Lab Level 3
  • Fort Level 3
  • Fort Attack 15
  • Cannon Level 3

Hard Mode

On Dark Forest II Stage 13 you are not allowed to use Forts. I was able to beat 13-1, but stage 13-2 was way more difficult. I had to farm 20,000+ crystals for Cannon upgrades on Mission 2 – Church: Rain of Arrow getting 899 crystals for 9 waves by not completing the Mission (read crystal farming technique above). This was the first stage I got stuck on for a mostly Fort build. You can watch the strategy I used with the link above in Strategies and Walkthroughs. The things I spent crystals on up until that point are in the description.

Stage 13-3 increases the difficulty even more and I had to farm 50,000+ crystals on Cannon Upgrades for the no Forts stage. I feel my biggest mistake was not choosing Wizards as they can attack air units. According to others, having Wizards and high Max Mana+Mana Recovery+Warrior Skill levels 10 up = A powerful weapon. Simple ways around this would be to farm crystals or use Props.

These are the things I spent crystals on that enabled me to beat Hard mode. I farmed about 70,000+ crystals and spent $0.

8 Max Mana
15 Mana Recovery
3 Crystal Magic
14 Fire Magic
2 Burning
3 Max Life

3 Bunker Level
10 Bunker Attack
5 Lab Level
8 Lab Attack
6 Fort Level
25 Fort Attack
5 Cannon Level
26 Cannon Attack

Warrior (Paladin)
0/15 Spellbook
3/15 Armor
3/15 Weapon


In the first 4 Missions you can only use 1 of each type of tower at a time. 1 Fort, 2 Bunker (Bunker Level 3 and Bunker Attack 5 or less to beat), 3 Cannon, 4 Lab. I would suggest not completing the first or second mission right away and just use it for crystal farming since you get more crystals than from stages (read crystal farming technique above). You have to pay $2 with real money for Missions 6-15 so its a good idea to not complete Mission 5 for farming purposes also if you intend to not spent real money. Mission 5 is also a lot easier and faster to farm than 1 thru 4.

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