Single-player games like Happy Z-Day
Below are 8 single-player Steam games similar to Happy Z-Day, ranked by player overlap. Every pick carries Steam's Single-player category, so multiplayer-only titles or always-online games don't sneak in. imho.run pulls the category data from Steam directly — Single-player here matches what the store labels.
Want the full alternatives list (paid + free + Steam Deck + cheaper picks)? See the parent games like Happy Z-Day page.
Ranked picks
- 1
Blood Waves
Single-player alternative to Happy Z-Day — playable solo, no multiplayer required. Shares Action and Strategy with Happy Z-Day.
Hardcore and bloody shooter where you will have to repel the attacks of the living dead using the destroying traps, defensive barricades and also weapon of close and long-range combat.
- 2
The Riftbreaker
Single-player alternative to Happy Z-Day — playable solo, no multiplayer required. Shares Action and Strategy with Happy Z-Day.
The Riftbreaker is a solo or Co-op base-building, survival game with Action-RPG elements for up to 4 players. Hack & slash countless hordes of enemies. Build up your base, craft powerful weapons and research new inventions to survive.
- 3
Town Of The Dead Life 死寂之城
Single-player alternative to Happy Z-Day — playable solo, no multiplayer required. Shares Strategy and Indie with Happy Z-Day.
《Town Of The Dead Life》 is an independent game with the background of eschatology. Players will play the role of one of the few surviving humans in the end of the world, surviving in difficult conditions and trying to change the fate of the world.
- 4
Decision: Red Daze
Single-player alternative to Happy Z-Day — playable solo, no multiplayer required. Shares Action and Strategy with Happy Z-Day.
Decision: Red Daze is an action RPG with a unique mix of survival and tower defense mechanics. Explore an apocalyptic wasteland, build a safe haven, and lead your team of specialists in a hopeless world, searching for a cure for the infectious disease that turns people into monsters.
- 5
Castle Craft
Single-player alternative to Happy Z-Day — playable solo, no multiplayer required. Shares Action and Strategy with Happy Z-Day.
Will your castle survive the relentless onslaught, or collapse under pressure? Build, manage resources, and outsmart your foes in a world where everything can be destroyed. Use strategy and creativity to turn the chaos into your greatest advantage!
- 6
Grim Nights
Single-player alternative to Happy Z-Day — playable solo, no multiplayer required. Shares Strategy and Indie with Happy Z-Day.
Your village must survive for 13 days! Gather resources, expand, explore the underground for riches, and train soldiers to defend against hordes of the undead.
- 7
They Are Billions
Single-player alternative to Happy Z-Day — playable solo, no multiplayer required. Shares Strategy with Happy Z-Day.
They Are Billions is a Steampunk strategy game set on a post-apocalyptic planet. Build and defend colonies to survive against the billions of the infected that seek to annihilate the few remaining living humans. Can humanity survive after the zombie apocalypse?
- 8
Zombie Cure Lab
Single-player alternative to Happy Z-Day — playable solo, no multiplayer required. Shares Strategy with Happy Z-Day.
In a world overrun by the undead, build a lab to fight back with science. Manage survivors, gather vital resources, and turn zombies into allies. Defend your base and research the cure to reclaim humanity.