Lucky Defense (What The Luck) is a brilliant, high-variance tower defense game from the creators of BBTAN. It takes the familiar TD formula and injects a massive dose of RNG, making every match feel completely different. You don't just buy units; you summon them based on luck, and the ability to merge them adds a layer of 'gambler's high' to the strategy.
The game is deceptively deep. While luck plays a huge role, knowing when to roll the roulette and when to save your resources is what separates the masters from the beginners. The co-op mode is particularly fun, as you have to coordinate with a partner to survive waves that would be impossible alone. It's addictive, stylish, and perfect for fans of Random Dice.
Available on: iPhone, iPad, iPod
Version 1.8.11Fri Feb 13 2026
■ Lunar New Year Event - Game City!
■ New Mythic Guardian: Chad!
- The Immortal Guardian, Giga Chad, is also available!
■ New Skin - Bread Blob
■ Bug Fixes & Other Improvements
How far can your luck take you? Have you tested your limits?
Introducing the ultimate luck-based tower defense game!
Try "What the Luck?" now and push your LUCK to the extreme!
- Summoning units is all based on LUCK! Beat the odds!
- Yes, it's a tower defense game! Defeat the monsters!
- You can also merge units! You just never know what you'll get!
- Feeling LUCKY? Take a big swing with the roulette!
To rise or to fall, LUCK is the question!
What the Luck? - A casual tower defense all about LUCK
Requires iOS 15.0 or later. Compatible with iPhone, iPad, and iPod touch.How far can your luck take you? Have you tested your limits?
Introducing the ultimate luck-based tower defense game!
Try [Lucky Defense] now and push your LUCK to the extreme!
- Summoning units is all based on LUCK! Beat the odds!
- Yes, it's a tower defense game! Defeat the monsters!
- You can also merge units! You just never know what you'll get!
- Feeling LUCKY? Take a big swing with the roulette!
To rise or to fall, LUCK is the question!
Lucky Defense - A casual tower defense all about LUCK










Lucky Defense is a casual tower defense game that focuses on the thrill of the gamble. Unlike traditional TD games, your units are determined by luck. Players can summon, merge, and gamble via a roulette system to acquire powerful Mythic and Immortal guardians. Success depends on managing your luck and making quick strategic decisions to fend off relentless monster hordes.
Unique luck-based summoning
Mythic and Immortal unit tiers
Exciting roulette mechanics
Engaging 2-player co-op mode
Always look to merge common units into higher rarities. If your luck is down, use the 'Lucky Machine' for a chance at a game-changing unit.
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Join a friend in co-op mode to pool your luck. Work together to reach wave 80 by balancing physical and magical damage types.
Mythic guardians like Lancelot and Iron Meow are currently top-tier for high-wave clears.