Free games like Undead Defense TD
Below are 8 free-to-play Steam games similar to Undead Defense TD, 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 Undead Defense TD page.
Ranked picks
- 1
Counter-Strike:Global Offensive
Free-to-play alternative to Undead Defense TD — 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.).
- 2
Outpath: First Journey
Free-to-play alternative to Undead Defense TD — no purchase or trial window.
Outpath: First Journey is a prologue chapter of the main game, Outpath. An experimental clicker base building game. Craft, gather & manage resources, build your base and buy more islands to exploit and expand!
- 3
The Riftbreaker: Prologue
Free-to-play alternative to Undead Defense TD — no purchase or trial window. Shares Strategy with Undead Defense TD.
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.
- 4
Tom Clancy's Rainbow Six Siege
Free-to-play alternative to Undead Defense TD — 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.
- 5
Muck
Free-to-play alternative to Undead Defense TD — no purchase or trial window.
Muck is a survival-roguelike. Collect resources, find items & build a base to survive for as long as you can.
- 6
Supermarket Together
Free-to-play alternative to Undead Defense TD — no purchase or trial window.
The multiplayer supermarket has arrived to your neighbourhood for free! Stock your shop space, unlock perks and franchises, hire employees or chase those pesky shoplifters. The more players, the more action!
- 7
Fallout Shelter
Free-to-play alternative to Undead Defense TD — no purchase or trial window.
Fallout Shelter puts you in control of a state-of-the-art underground Vault from Vault-Tec. Build the perfect Vault, keep your Dwellers happy, and protect them from the dangers of the Wasteland.
- 8
Bloons TD Battles 2
Free-to-play alternative to Undead Defense TD — no purchase or trial window. Shares Strategy with Undead Defense TD.
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!