Best Merge Tower Defense 2021 Apps & Games

210+ iOS apps & games curated and reviewed

4.6 avg rating
20 free apps & games
Updated July 2026

The best merge tower defense 2021 apps and games on iPhone average 4.6★ across 210+ titles — we've ranked them by what real users actually keep on their phones. Updated July 2026.

Compare top Merge Tower Defense 2021 Apps & Games (July 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1Merge Tower Defense 2021Merge Tower Defense 2021Free4.3★ (32)YesNoJul 2026
2Merge Clash: Tower DefenseMerge Clash: Tower DefenseFree4.8★ (13K)YesYesJul 2026
3Merge Kingdoms - Tower DefenseMerge Kingdoms - Tower DefenseFree4.8★ (1.9K)YesYesJul 2026
4The Tower - Idle Tower DefenseThe Tower - Idle Tower DefenseFree4.2★ (19K)YesYesJul 2026
5Rush Royale: Tower Defense RPGRush Royale: Tower Defense RPGFree4.5★ (95K)YesYesJul 2026
6North Tower! Merge TD DefenseNorth Tower! Merge TD DefenseFree4.7★ (845)YesYesJul 2026
7Shooting Tower: Defense GameShooting Tower: Defense GameFree4.7★ (16K)YesNoJul 2026
8Merge Gun: Tower DefenseMerge Gun: Tower DefenseFree4.8★ (1.1K)YesYesJul 2026

Top Picks for Merge Tower Defense 2021

Merge Tower Defense 2021#1

Merge Tower Defense 2021 by Lazycell Inc.

Drag and Merge
Editor's Choice
🎮 Games
4.3(32 ratings)
FreeAds
Merge Tower Defense 2021 screenshot 1
Merge Tower Defense 2021 screenshot 2
Merge Tower Defense 2021 screenshot 3

A simple tower defense game where you drag and merge towers to level them up. Defend your gem from enemies and bosses with increasingly powerful defenses. Test your tactical skills in this classic genre.

Merge Clash: Tower Defense#2

Merge Clash: Tower Defense by Block Puzzle Games Inc.

Tower Defense Games Random PvP
Strong Contender
🎮 Games
4.8😐(13K ratings)
FreeAdsIn-App Purchases
Merge Clash: Tower Defense screenshot 1
Merge Clash: Tower Defense screenshot 2
Merge Clash: Tower Defense screenshot 3
Merge Clash: Tower Defense screenshot 4
Merge Clash: Tower Defense screenshot 5
Merge Clash: Tower Defense screenshot 6

Engage in strategic tower defense battles by collecting, merging, and upgrading unique towers. Defend your kingdom against waves of enemies and epic bosses in both solo and multiplayer modes. Master deck building and tactical deployment to outwit opponents.

What We Love

  • 🚀 Fun and addictive gameplay
  • 👍 No ads
  • 🤝 Enjoyable co-op mode
  • 💡 Unique merge-based tower defense concept

Room to Improve

  • 🐛 Frequent crashes and bugs
  • 💰 Pay-to-win mechanics
  • 🎲 Overly reliance on RNG and luck
Merge Kingdoms - Tower Defense#3

Merge Kingdoms - Tower Defense by FunCraft, Inc

Merge your defenses!
Worth Considering
🎮 Games
4.8😞(1.9K ratings)
FreeAdsIn-App Purchases
Merge Kingdoms - Tower Defense screenshot 1
Merge Kingdoms - Tower Defense screenshot 2
Merge Kingdoms - Tower Defense screenshot 3
Merge Kingdoms - Tower Defense screenshot 4
Merge Kingdoms - Tower Defense screenshot 5
Merge Kingdoms - Tower Defense screenshot 6

Engage in a unique tower defense experience with idle progression. Combine towers to enhance their power and strategically place them to overcome thousands of enemy waves. Unlock new abilities and power-ups to conquer increasingly challenging stages and bosses.

What We Love

  • 🎮 Throwback game
  • 👍 Easy to understand
  • 🕹️ Fun and addictive
  • 💰 Good payout

Room to Improve

  • 📺 Excessive ads
  • 💰 Overpriced premium options
  • 🐛 Glitches and bugs

More Merge Tower Defense 2021 apps to explore

4
The Tower - Idle Tower Defense
The Tower - Idle Tower Defense
The Tower - Idle Tower Defense
Base defense, kill the enemy
Free

Build and upgrade a single tower to defend against waves of enemies in this incremental tower defense game. Make permanent upgrades, unlock new areas, and compete in tournaments. Enjoy addictive gameplay with a vast array of strategic choices.

Build and upgrade a single towerDefend against enemy wavesPermanent upgrades and research
🎮 Games
(19K)
free with in-app purchases
5
Rush Royale: Tower Defense RPG
Rush Royale: Tower Defense RPG
Rush Royale: Tower Defense RPG
PvP Card battle・Merge Strategy
Free

Collect and merge units to build a powerful deck for strategic base defense. Engage in PvP battles or team up with friends in Co-Op mode to conquer enemies and earn rewards. Master unique unit abilities and faction synergies to prevail.

Unit collection and mergingDeck building for base defensePvP battles with trophies
🎮 Games
(95K)
free with in-app purchases
6
North Tower! Merge TD Defense
North Tower! Merge TD Defense
North Tower! Merge TD Defense
3D Tower Defense Strategy Game
Free

Merge weapons to power up your army and defend your land in this 3D tower defense strategy game. Combine merge, clicker, and idle gameplay to defeat enemies and bosses. Unlock heroes and battle other players for rewards.

Merge weapons to power upBuild and grow your armyStrategic tower placement
🎮 Games
(845)
free with in-app purchases
7
Shooting Tower: Defense Game
Shooting Tower: Defense Game
Shooting Tower: Defense Game
Merge guns and guard the base
Free

Engage in an intense shooting and strategy game where you merge defensive towers to repel waves of monsters, orcs, and aliens. Develop tactical formations and upgrade your war machines to protect your base and survive challenging boss attacks.

Merge towers for upgradesStrategic tower placementRepel diverse enemy waves
🎮 Games
(16K)
free with in-app purchases
8
Merge Gun: Tower Defense
Merge Gun: Tower Defense
Merge Gun: Tower Defense
Merge to defend
Free

Merge and upgrade towers to defend your realm against waves of monsters. This game offers simple, engaging gameplay with strategic depth for countless challenges. Enjoy stunning graphics and lively sound in this free-to-play tower defense experience.

Merge and upgrade towersStrategic defense planningDefend against monster waves
🎮 Games
(1.1K)
free with in-app purchases
9
Merge Defense 3D!
Merge Defense 3D!
Merge Defense 3D!
Strategic Tower Defense
Free

A turn-based tower defense game where players strategically place and merge defenders to fend off advancing enemy blocks. It offers offline play and a challenging puzzle experience for a daring mind.

Turn-based gameplayMerge defenders to upgradeStrategic placement
🎮 Games
(1.1K)
free with in-app purchases
10
Merge Tactics: Castle Defense
Merge Tactics: Castle Defense
Merge Tactics: Castle Defense
Merge TD - Block the Invaders
Free

This tower defense game challenges players to strategically place and merge blocks to create powerful units. Build diverse decks and expand your territory to fend off waves of invaders, while growing your castle and characters for enhanced skills and rewards.

Strategic block placementMerge blocks into powerful unitsCreate custom battle decks
🎮 Games
(889)
free with in-app purchases
11
FireLine: Merge Defense
FireLine: Merge Defense
FireLine: Merge Defense
Best merge tower defense game
Free

Engage in an addictive tower defense experience where you merge cannons to create powerful upgrades. Strategically position your enhanced defenses to repel waves of cube enemies and formidable bosses.

Merge cannons for upgradesStrategic defense positioningDefeat cube armies
🎮 Games
(531)
free with in-app purchases
12
Crazy Defense Heroes: RPG TD
Crazy Defense Heroes: RPG TD
Crazy Defense Heroes: RPG TD
Tower Defense Strategy Game
Free

Build and upgrade towers, collect hundreds of cards, and command heroes to defend your kingdom. Engage in strategic battles against hordes of enemies across over 1,000 levels. Join forces with other players for epic clan quests and boss fights.

Tower defense strategyCollect over 400 cardsCombine Hero, Tower, Spell, and Equipment cards
🎮 Games
(8.1K)
free with in-app purchases
13
Crazy Kings Tower Defense Game
Crazy Kings Tower Defense Game
Crazy Kings Tower Defense Game
Fight Strategic TD Battles
Free

Engage in strategic tower defense battles across diverse environments. Collect and upgrade over 90 cards, including heroes, towers, spells, and equipment, to defeat over 100 types of enemies and challenging bosses. Compete in daily battles and weekly tournaments for rewards.

Over 90 collectible cards20+ specialized towers20+ diverse spells
🎮 Games
(1.8K)
free with in-app purchases
14
Lucky Defense!
Lucky Defense!
Lucky Defense!
Epic Clash of Survival!
Free

Experience a unique tower defense game where luck dictates your strategy. Summon units, merge them for unpredictable outcomes, and test your fortune with a roulette feature to defeat waves of monsters.

Luck-based unit summoningTower defense gameplayUnit merging for random results
🎮 Games
(12K)
free with in-app purchases
15
Brave Merge - Battle & Defense
Brave Merge - Battle & Defense
Brave Merge - Battle & Defense
The undead are attacking!
Free

Defend your kingdom from an undead invasion by merging warriors to create powerful knights. Build and upgrade village structures to generate passive income and invest in your army's defense. Strategize your battles against zombie hordes and fearsome bosses in this adventure game.

Merge warriors to level upUnlock village buildings for passive incomeUpgrade buildings with a second currency
🎮 Games
(5.5K)
free with in-app purchases
16
Power Painter: Shoot & Defense
Power Painter: Shoot & Defense
Power Painter: Shoot & Defense
Paint Ball & Merge Tower Game
Free

Engage in a strategic merge and tower defense game where you merge towers, shoot paint bubbles, and defend against bosses. Progress through increasingly challenging levels with stunning graphics and collect various paintball guns to aid your defense.

Merge towersShoot paintball bubblesPaint the screen
🎮 Games
(47K)
free with in-app purchases
17
TDS - Tower Destiny Survive
TDS - Tower Destiny Survive
TDS - Tower Destiny Survive
Idle zombie defense survival
Free

Build and defend a mobile tower against waves of attacking zombies. Collect blocks to construct your fortress, equip it with weapons, and strategize your defense to survive the apocalypse. Upgrade your arsenal and progress through levels in this engaging RPG shooter.

Tower construction and defenseIdle zombie wave shooterWeapon collection and upgrades
🎮 Games
(87K)
free with in-app purchases
18
Fortress Merge・Puzzle Defense
Fortress Merge・Puzzle Defense
Fortress Merge・Puzzle Defense
요새 병합하다 퍼즐 도시 방어 전쟁게임
Free

Engage in strategic city defense by merging and upgrading buildings to fend off relentless enemy waves. This action-packed puzzle game challenges you to plan your moves carefully and use resources wisely to survive. Immerse yourself in exciting gameplay with stunning graphics and fast-paced action.

Merge and upgrade buildingsStrategic gameplay and resource managementDefend against enemy waves
🎮 Games
(10K)
free with in-app purchases
19
Tank Fortress - tower defense
Tank Fortress - tower defense
Tank Fortress - tower defense
Merge, Build and Fire!
Free

Build a mobile fortress, merge tanks to unlock powerful weapons, and defend against rogue machines. Engage in strategic battles, compete with other players globally, and enjoy idle progression with rewards.

Merge and evolve unique tanksBuild a movable fortressReal-time online PvP battles
🎮 Games
(183)
free with in-app purchases
20
Towerlands: Tower defense (TD)
Towerlands: Tower defense (TD)
Towerlands: Tower defense (TD)
Build base & protect Kingdom
Free

Build and defend your fantasy kingdom in this strategy simulation game. Recruit heroes, upgrade towers, and conquer enemy cities. Engage in tactical warfare, join clans, and compete in global tournaments.

Strategic empire buildingTactical warfare and hero managementConquer and expand territory
🎮 Games
(7.3K)
free with in-app purchases

FAQ about Merge Tower Defense 2021

What are the best merge tower defense 2021 apps & games for iPhone?
Merge Tower Defense 2021 tops our merge tower defense 2021 apps & games ranking as of July 2026, with a 4.3-star average from 32 App Store ratings, and it's free to download.
Yes — 20 of the top merge tower defense 2021 apps & games we rank are free to download, including Merge Tower Defense 2021 and Merge Clash: Tower Defense.
Merge Tower Defense 2021 shows ads and has no in-app purchases, according to its App Store listing as of July 2026.
We track 210+ merge tower defense 2021 apps & games on the iOS App Store as of July 2026, ranked by rating, recency, and analysis of real user reviews.
The main gameplay involves dragging and merging your towers to level them up. This creates more powerful defenses to protect your gem from incoming enemies and bosses.
The provided data does not specify if Merge Tower Defense 2021 supports offline play. Many tower defense games offer offline modes, but this feature is not explicitly mentioned.