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Check out this fantastic list of free-to-play tower defense games you can enjoy on Steam right now, updated on September 22nd 2026. Looking for even more free titles? Explore the complete list of the best free to play tower defense games on Steam.
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1. Idle Hero TD - Tower Defense RPG
Endless Idle Tower Defense with deep strategy and RPG progression and combat mechanics. Recruit, upgrade, and position powerful fantasy heroes, discover game-changing synergies, and survive infinite monster waves. Grow stronger every run with literally millions of upgrades and endless auto battles. Idle Hero TD - Tower Defense RPG is a early access, strategy and tower defense game. Released on May 03rd 2024 has received 1,304 reviews of which 1,080 were positive and 224 were negative resulting in a rating of 7.9 out of 10. The game has hit the top spot as the #1 most played tower defense game, thanks to its 1,689 peak concurrent players over the last day.
7.9
1,080
224
1,689
players
2. The Perfect Tower II
The Perfect Tower II is a mix between an incremental and a tower defense game. Build a town, manage resources and explore a variety of mini-games and tons of upgrades. Fully automate your game and watch numbers going up! The Perfect Tower II is a strategy, idler and tower defense game. Released on November 30th 2025 has received 3,639 reviews of which 3,201 were positive and 438 were negative resulting in a rating of 8.5 out of 10. While seeing 606 players online at once in the last 24 hours, this game is currently ranked #2 among tower defense games based on player count.
8.5
3,201
438
606
players
3. Bloons TD Battles 2
From the creators of Bloons TD6... Bloons TD Battles 2 is a brand new installment of the top-rated head-to-head tower defense game. Gather your Hero, choose your team of powerful Monkey Towers, and prepare to battle one on one against other players and relentless waves of Bloons! Bloons TD Battles 2 is a tower defense, multiplayer and competitive game. Released on November 30th 2021 has received 34,226 reviews of which 28,910 were positive and 5,316 were negative resulting in a rating of 8.3 out of 10. While seeing 396 players online at once in the last 24 hours, this game is currently ranked #3 among tower defense games based on player count.
8.3
28,910
5,316
396
players
4. Dungeon Defenders II
Dungeon Defenders II is a cooperative Action Tower Defense game packed with roleplaying elements like loot, leveling, and pets. Dungeon Defenders II is a multiplayer, online co-op and co-op campaign game. Released on June 20th 2017 has received 21,823 reviews of which 16,882 were positive and 4,941 were negative resulting in a rating of 7.6 out of 10. With 372 concurrent players in the last 24 hours, the game currently holds the #4 spot among the most played tower defense games.
7.6
16,882
4,941
372
players
5. Bloons Monkey City
Create, upgrade, and customize your very own Bloons Monkey City in this groundbreaking blend of city building and tower defense awesomeness! Bloons Monkey City is a strategy, action and city builder game. Released on April 10th 2020 has received 6,222 reviews of which 5,676 were positive and 546 were negative resulting in a rating of 8.8 out of 10. With 195 concurrent players in the last 24 hours, the game currently holds the #5 spot among the most played tower defense games.
8.8
5,676
546
195
players
6. Bloons TD Battles
Go head to head with other players in a Bloon-popping battle for victory. From the creators of best-selling Bloons TD 6, this all new Battles game is specially designed for multiplayer combat, featuring the ability to control bloons directly and send them charging past your opponent's defenses. Bloons TD Battles is a tower defense, multiplayer and strategy game. Released on April 20th 2016 has received 29,096 reviews of which 26,414 were positive and 2,682 were negative resulting in a rating of 8.9 out of 10. With 175 concurrent players in the last 24 hours, the game currently holds the #6 spot among the most played tower defense games.
8.9
26,414
2,682
175
players
7. Infinitode 2 - Infinite Tower Defense
Infinitode 2 - a strategy in the Tower Defense genre, in which the player will have to build towers to protect his base from endless waves of enemies. The game features huge maps, lots of towers, resource miners, upgrade tree and map editor. Infinitode 2 - Infinite Tower Defense is a level editor, tower defense and building game. Released on May 06th 2021 has received 3,674 reviews of which 3,354 were positive and 320 were negative resulting in a rating of 8.8 out of 10. With 127 concurrent players in the last 24 hours, the game currently holds the #7 spot among the most played tower defense games.
8.8
3,354
320
127
players
8. Ninja Kiwi Archive
Enjoy some of the best loved Flash games of the past in this awesome time capsule of over 60 Ninja Kiwi classics. Experience a piece of history and play the original Flash games that spawned the worldwide phenomenon of Bloons TD. Ninja Kiwi Archive is a casual, arcade and strategy game. Released on July 08th 2020 has received 5,439 reviews of which 5,107 were positive and 332 were negative resulting in an impressive rating of 9.1 out of 10. With 114 concurrent players in the last 24 hours, the game currently holds the #8 spot among the most played tower defense games.
9.1
5,107
332
114
players
9. Bloons Adventure Time TD
Defend Ooo from the Bloon invasion in this epic tower defense crossover. Bloons Adventure Time TD is a strategy, action and tower defense game. Released on January 16th 2019 has received 4,302 reviews of which 3,743 were positive and 559 were negative resulting in a rating of 8.4 out of 10. The game currently holds the #9 spot among the most played tower defense games.
8.4
3,743
559
60
players
10. Diplomacy is Not an Option: Shareware
Diplomacy is Not an Option: Shareware is a free prequel to the original game. In a medieval fantasy world, you are to build settlements, raise huge armies, and defend against massive hordes of enemies. Learn how Ironbrow clan shaped the world's map the first time - if you survive, that is. Diplomacy is Not an Option: Shareware is a strategy, city builder and colony sim game. Released on April 30th 2025 has received 816 reviews of which 752 were positive and 64 were negative resulting in a rating of 8.7 out of 10. The game currently holds the #10 spot among the most played tower defense games.
8.7
752
64
38
players
More Tower Defense & Related Games
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