Tower Defense

Tower defense is a subgenre of strategy games where players protect their territory against waves of enemy attackers.



Use resources wisely to survive all waves of increasingly difficult enemies.


↩️ Pathing

πŸ”ΈπŸ”· Variety (health, number, loot, etc) βž• Increasing difficulty (type, number, etc)


βœ–οΈ Placement

πŸ”ΈπŸ”· Variety (attack strength, type, size, etc)

πŸͺ™ Buy towers / 🧱 Build with resources

πŸ†™ Upgrade towers

πŸ”“Unlock new types

Keys of Success

  • Everyone Can Play - Main player actions are placing units

  • Play for Long - Many levels and difficulties, new releases, endless mode

  • Flexible Play Modes - Multiplayer with humans or singleplayer with NPCs

Game Loops

Below is a general game loop diagram for this genre. Your game's loops may vary.

Variations of Strategy

Real-Time Strategy (RTS): Players make decisions in real-time, managing resources and armies.

Turn-Based Strategy (TBS): Players take turns making strategic decisions and controlling units.

4X (Explore, Expand, Exploit, Exterminate): Empire-building and grand strategy.


Games may have more complex core loops or added secondary loops to offer players more interesting decisions to make. The following examples may be broken down differently into smaller steps:

  • Resource Farming - Harvest resources (building materials, currency, etc)

  • Research - Unlock new tower types or abilities through research

Useful Logic

Template & Tutorial Videos

Tower Defense Template

NPC Waves

Basic Tower, Money, Life System

Tower Building System

Wave Counter System

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