FibDefense: Math Tower Defense
Fibonacci Puzzle Strategy
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Every tower in FibDefense deals Fibonacci damage (1, 2, 3, 5, 8, 13, 21, or 34) and can only fire at a monster if its shot damage is less than or equal to that monster's current HP. No overkill. Ever.
This single rule turns every wave into a living math puzzle. Monsters march with HP values that always have a solution, but finding it requires precise placement, careful timing, and knowing which Fibonacci values chain together to reach the kill. When it clicks, towers drop a monster in a perfect cascade.
PUZZLE MODE
34 hand-built levels, each one a self-contained problem: a fixed gold budget, every wave shown before it comes, and a verified perfect solution waiting to be found. No random drops, no filler — just you, the numbers, and the cleanest line to a five-star solve. Every world lays out its own boards, so each is a full campaign of its own. The first 8 levels are free; one unlock opens all 34 on every world.
SIX WORLDS
Fantasy, Sci-Fi, Military, Retro, Pirates, Horror. Each world has its own tower sprites, nine tiers of creeps, a handcrafted environment, and a unique boss that arrives as your ultimate challenge.
FIVE DIFFICULTY LEVELS
Relaxed mode lets you spot kill solutions at a glance. Expert mode requires planning multiple towers ahead, with longer Fibonacci chains needed to solve each monster's HP. The difficulty scales in logic, not just stats.
ZECKENDORF MODE: THE ULTIMATE TEST
Named for a real theorem, built for perfectionists. In Zeckendorf mode, each Fibonacci value can strike a monster only ONCE, every kill must be composed from different numbers, like building an integer from Fibonacci blocks without repeating a block. Your towers respect the math: no shot ever overshoots, and no tower will fire if it would leave a monster's HP impossible to finish. You get 55 lives (the next Fibonacci number after the 34 tower). You'll need them.
BOSS ENCOUNTERS
Survive the waves and a boss appears: massive HP, relentless movement, and a gold reward worth fighting for. In Continuous mode, every boss encounter scales higher. How long can you hold the line?
FREE TO TRY
FibDefense is free to play: the Fantasy and Sci-Fi worlds, all 20 waves of Classic mode, the first 8 Puzzle levels, Relaxed and Normal difficulties, and light and dark appearance — included at no cost.
ONE UNLOCK. EVERYTHING.
One single purchase unlocks:
- All 34 Puzzle levels, on every world
- All six worlds (and any future worlds we create)
- Hard, Expert, and Zeckendorf difficulties
- Endless wave mode
- Continuous survival mode
- Game speed control and adjustable wave timers
No subscriptions. No ads after you unlock. Yours forever.
THE MATH IS REAL
Zeckendorf's theorem proves that every positive integer can be written as a sum of distinct, non-consecutive Fibonacci numbers. That's why every monster in FibDefense can always be solved — and in Zeckendorf mode, the theorem becomes the rules of the game itself: distinct numbers, exact sums, no shortcuts. The math isn't decoration. It's the foundation the entire game is built on.
NEW: PUZZLE MODE
34 hand-built levels of pure Fibonacci problem-solving. A fixed budget, every wave shown before it comes, and one perfect solution per board waiting to be found — chase the five-star solve. Each world plays its own set of boards, so every world is a campaign of its own. The first 8 levels are free (for Sci-Fi and Fantasy); one unlock opens all 34 of all themes.
NEW: ZECKENDORF MODE
The hardest way to play FibDefense. Each Fibonacci value can strike a monster only once, so every kill has to be built from distinct numbers. Your towers respect the math, and they won't take a shot that leaves a monster impossible to finish. 55 lives. No shortcuts.
ALSO IN THIS UPDATE
- Per-world star progress and level unlocks across all six worlds
- Drag to reposition your towers mid-game while the action holds
- Wave previews so you can plan before the creeps arrive
- A cleaner home screen, level select, and difficulty picker
- Audio reliability and stability fixes throughout
Thanks for playing. The math is real.
The developer, Tigerclaw Technologies, LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Identifiers
- Usage Data
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The following data may be collected but it is not linked to your identity:
- Identifiers
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Tigerclaw Technologies, LLC
- Size
- 58.9 MB
- Category
- Strategy
- Compatibility
Requires iOS 15.1 or later.
- iPhone
Requires iOS 15.1 or later. - iPod touch
Requires iOS 15.1 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
13+
- 13+
- Frequent
Cartoon or Fantasy Violence
Infrequent
Horror/Fear Themes
Guns or Other Weapons
Contains
Advertising
- In-App Purchases
Yes
- Full Game Unlock $2.99
- Copyright
- © 2026 Tigerclaw Tech