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
DFHack - Dwarf Fortress Modding Engine
Free-to-play alternative to Undead Defense TD — no purchase or trial window. Shares Strategy with Undead Defense TD.
Extensions for Dwarf Fortress, including bugfixes, interface improvements, automation agents, design blueprints, modding building blocks, and other tools.
- 5
Nazi Zombies
Free-to-play alternative to Undead Defense TD — no purchase or trial window.
Nazi Zombies is a cooperative survival game where players fend off escalating waves of Nazi zombies, earning points by killing zombies and repairing barriers to buy weapons, upgrades, perks, and unlock new map areas to maximize their survival.
- 6
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.
- 7
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.
- 8
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!