Free games like Invaders Tower Defense Online
Below are 8 free-to-play Steam games similar to Invaders Tower Defense Online, ranked by player overlap and content similarity. No purchase or Steam login required to view the list. Every pick is a full free-to-play title — not a demo, trial, or time-limited giveaway. imho.run's catalogue refreshes daily, so newly free or newly popular titles surface here without manual editing.
Want the full alternatives list (paid + free + Steam Deck + cheaper picks)? See the parent games like Invaders Tower Defense Online page.
Ranked picks
- 1
STRAFTAT
Free-to-play alternative to Invaders Tower Defense Online — no purchase or trial window.
STRAFTAT is a 1v1/2v2 ONLINE first person SHOOTER with quick rounds in over 350 MAPS ; Including all WEAPONS, proximity chat and 4 players FFA.
- 2
Counter-Strike:Global Offensive
Free-to-play alternative to Invaders Tower Defense Online — no purchase or trial window.
Counter-Strike:Global Offensive (CS:GO) expands upon the team-based action gameplay that it pioneered when it was launched over 2 decades ago. CS:GO features new maps, characters, weapons, and game modes, and delivers updated versions of the classic CS content (de_dust2, etc.).
- 3
Landfall Archives
Free-to-play alternative to Invaders Tower Defense Online — no purchase or trial window. Shares Strategy and Indie with Invaders Tower Defense Online.
Break into the Landfall Archives to steal and play previously unreleased games, demos, interactive slide shows, and even an unreleased version of Totally Accurate Battle Simulator from 2017!
- 4
The Riftbreaker: Prologue
Free-to-play alternative to Invaders Tower Defense Online — no purchase or trial window. Shares Strategy and Indie with Invaders Tower Defense Online.
The Riftbreaker: Prologue allows you to experience the events taking place before the story campaign of the main game. Explore an entirely new world. Gather resources. Build up a base. Defend yourself from thousands of alien creatures.
- 5
Jigsaw Puzzle Dreams
Free-to-play alternative to Invaders Tower Defense Online — no purchase or trial window. Shares Indie with Invaders Tower Defense Online.
Beautiful Multiplayer Jigsaw Puzzle game where you can design the room you play in!
- 6
Counter-Strike 2
Free-to-play alternative to Invaders Tower Defense Online — no purchase or trial window.
For over two decades, Counter-Strike has offered an elite competitive experience, one shaped by millions of players from across the globe. And now the next chapter in the CS story is about to begin. This is Counter-Strike 2.
- 7
Dota 2
Free-to-play alternative to Invaders Tower Defense Online — no purchase or trial window. Shares Strategy with Invaders Tower Defense Online.
Every day, millions of players worldwide enter battle as one of over a hundred Dota heroes. And no matter if it's their 10th hour of play or 1,000th, there's always something new to discover. With regular updates that ensure a constant evolution of gameplay, features, and heroes, Dota 2 has taken on a life of its own.
- 8
Tom Clancy's Rainbow Six Siege
Free-to-play alternative to Invaders Tower Defense Online — no purchase or trial window.
Rainbow Six® Siege is the reference in tactical team shooters, where elite strategy and execution triumph. Enjoy free access to Quick Match, Unranked, and Dual Front game modes with a selection of operators.