FibDefense: Math Tower Defense
Fibonacci Puzzle Strategy
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.
What's New in FibDefense
1.06
July 14, 2026
NEW: ZECKENDORF MODE The ultimate difficulty for perfectionists. Each Fibonacci value can hit a monster only once — every kill must be built from different numbers, exactly like the theorem the game is named for. 55 lives. Perfect placement or bust. ALSO NEW - Dark mode is now the default — with a full light/dark appearance toggle in Settings - Reload rings: see each tower's cooldown sweep so you know exactly when it fires next - iOS privacy: the app now asks permission before showing personalized ads FIXES & BALANCE - Smarter towers: they no longer aim at monsters they can't legally hit - Sound effects no longer stack or play late during heavy waves - Projectiles no longer freeze on screen after the final kill of a wave - HUD stats are now clearly visible in dark mode - Zeckendorf economy tuned: gold payouts taper once your treasury overflows — spend to keep earning
MoreIn-App Purchases
$2.99
Full Game Unlock
Unlock all modes & themes. No ads. One-time purchase.
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.