Absolutely nothing to say. Not bad!! Awesome
I like it very much. I have used this one for a long time.
The interface is comfortable and beautiful
Now that I have fluency, I can be very willful.
Free
In-App PurchasesWith Ads
About
Engage in a unique tower defense experience where every tower's damage is based on Fibonacci numbers. Solve mathematical puzzles to defeat monsters with precise HP values, ensuring no overkill. Explore diverse worlds and challenge yourself with multiple difficulty levels.
✓Fibonacci damage system
✓No overkill mechanic
✓Six distinct worlds
✓Five difficulty levels
✓Zeckendorf mode challenge
✓Boss encounters
✓Single purchase unlocks all content
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What's New in FibDefense
1.1.0
August 10, 2026
THE EXACT-ZERO UPDATE Every weapon now follows one clear rule: a hit only lands when its Fibonacci damage fits the target's remaining HP, and every kill lands on exactly zero. Single-target, splash, and beam towers all play by the same math. NEW IN 1.1 • Live arithmetic feedback shows how every hit changes a creep's HP • A guided first-session tutorial leads directly into Puzzle 1 • A 34-puzzle Journey with clearer progression; the first 8 puzzles remain free • Hand-painted terrain for Sci-Fi, Fantasy, Military, Retro, Pirates, and Horror • Cleaner onboarding, ad timing, purchase handling, review timing, and privacy controls • Stability and native build improvements throughout Plan the sequence. Watch the numbers fall into place. Finish at exactly zero.
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In-App Purchases
$2.99
Full Game Unlock
Unlock all modes & themes. No ads. One-time purchase.
User reviews
FAQ
What is FibDefense?
FibDefense is a unique tower defense game where all tower damage is based on Fibonacci numbers. The core mechanic involves solving mathematical puzzles to defeat monsters with specific HP values, ensuring no damage is wasted.
Does FibDefense have ads?
FibDefense contains advertisements. However, a single purchase unlocks all content and removes ads permanently, offering an ad-free experience.
What are the different game modes in FibDefense?
FibDefense offers several modes including Classic, Relaxed, Expert, Zeckendorf, Continuous, and Endless wave modes. Each mode presents unique challenges and difficulty scaling.
What is Zeckendorf mode in FibDefense?
Zeckendorf mode is the ultimate test where each Fibonacci value can only be used once per kill, requiring exact sums of distinct Fibonacci numbers to defeat monsters, based on Zeckendorf's theorem.
How much does FibDefense cost?
FibDefense is free to try, offering access to the Fantasy and Sci-Fi worlds, 20 waves of Classic mode, and Relaxed/Normal difficulties. A single purchase unlocks all content, including future worlds and all difficulty levels.
What devices is FibDefense available on?
FibDefense is currently supported on iPhone and iPod devices. The game is rated for ages 12+.
How often is FibDefense updated?
FibDefense was last updated on July 14, 2026, with version 1.06. Future updates may introduce new worlds and content.
What makes FibDefense different from other tower defense games?
The primary differentiator is its core mechanic based on Fibonacci numbers and the mathematical puzzle aspect of defeating enemies with precise HP values, avoiding overkill entirely.