Games like Operation: Outbreak Idle

'Night of the Dead' is an open-world game that combines elements of exploration, tower defense, survival, and crafting. Traverse a world dominated by zombies while collecting various resources and powerful equipment. Build a fortress to survive the hordes of zombies that swarm every night!

The horde is here to eat your brain and murder every single one of your scientists. Gather your forces, this is the last stand before we lose the facility! Place guards, close doors, and position traps. Survive as long as you can!

A modern hybrid of the classic RTS and modern Tower Defense. Recruit soldiers, place them on slots and let them shoot incoming waves of zombies by their own. Order supplies, throw grenades, order airstrikes and many more... Perfect mix of strategy, tactics and micromanagement.

Top down, action packed, multiplayer, zombie shooter. Build your base with friends and see how long you can survive the endless horde of zombies. Level up with friends, or alone, how you die is up to you.

Zombie Tower Defense: Join the ongoing war, in an open world, against the undead zombie horde. Choose between multiple powerful heroes all with unique epic gear and skills! With the wide variety of towers you can create your own perfect strategy.

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.

Zombies are invading your home, and the only defense is your arsenal of plants! Armed with an alien nursery-worth of zombie-zapping plants like peashooters and cherry bombs, you'll need to think fast and plant faster to stop dozens of types of zombies dead in their tracks.

Over 9000 Zombies! is top-down arcade action blown out of all reasonable proportions. An endless horde of zombies is coming your way, how long can you survive?

Top-down zombie shooter with tower defense elements featuring up to 4 players local and online co-op. Build your base by day, defend it by night, put your skills to the test to stay alive as long as possible! Darkness is coming. How long can YOU survive?

Unturned is an open-world zombie survival sandbox game. As one of the few not yet turned, you must fight to remain among the living.

Get ready for the ULTIMATE tower defense onslaught. Build, deploy, research and upgrade your defenses in this epic, old school RTS inspired sci-fi adventure.

This is an open-world zombie survival game set in a quarantined city. You play as a student left behind due to missing the evacuation convoy. Together with classmates and other survivors, you must defend the school, survive, and await rescue.

The zombie apocalypse is upon us and it's up to you to evacuate everyone before they fall prey to the undead. Conduct massive rescue operations with a helping hand from snipers, artillery crews, orbital bombardments, and more.

Innovative Tower Defense inspired by legendary Alien Shooter series! The game was created in keeping with the best traditions of Sigma`s games, no concessions of any kind - everything is just like in real life!

Shoot, slice and surf on zombies by yourself or with friends. Fight overwhelming amounts of zombies and other monsters summoned by an evil wizard (ooOooOOOo spooky) in an early 1900s London.

All the horrors of zombie apocalypse in adorable pixelated form! Craft, explore and rescue people in a city overrun by the zombie horde. Good luck, survivors!

Defend against hordes of zombies in this fun filled top-down shooter. Build and upgrade your base, unlock powerful guns, and take on challenging bosses with up to 4 players in online co-op. Play minigames to earn bonuses and survive the zombie apocalypse one night at a time!

SurrounDead is an open world survival game. Taking place in a world ravaged by an apocalyptic catastrophe. The dead reign free and will stop at nothing to kill you.

Part turn-based resource management, part real-time defense shooter, Emerge places you into a futuristic world, ravaged by a zombie Apocalypse.

If you like tower defense games , this game is for you ! A game is classic addictive tower defense / defense TD, style game and a lot of features. You can build towers, you can use abilities(bombs and soldiers) and you can use hero!

Make your stand against the collapse of society in the ultimate zombie survival-fantasy game. Explore an open world full of dangers and opportunities that respond to your every decision. Recruit a community of playable survivors, each with their own unique skills and talents.

"Arms Evolution: ZOMBIE DESTROYER" is a unique Roguelite tower defense game. You will slaughter thousands of zombies in the game and enhance your weapon towers through build character in the RPG way. and , the game also offers an idle mode, so you can enjoy building weapons anytime and anywhere.

The end is here. Life as you knew it has gone to hell after the mother of all zombie outbreaks. Now you and the few scattered survivors must band together to survive and rebuild in a 3rd-person action game set in a dynamic open world.

Are you ready for the zombie apocalypse? We've done the research and want to make sure you're prepared. When the news reports the zombies are here and your friend gives you a call, "They're here. I need you," how will you respond? That's right, you'll say "On my way. We've got this thanks to ZTS!"

20 Minutes Till Dawn is a survival roguelite where endless hordes of creatures lurk from the dark. Craft an array of overpowering builds and eradicate waves of Lovecraftian nightmares. Will you be able to survive the night?

The virus has devastated cities and lands. Most of the population died, the rest turned into the walking dead. You're one of the last survivors. Do whatever it takes to last another day.

Online shooter with a variety of game modes and a huge arsenal of weapons. Fight with other players, or team up with them to defeat hordes of zombies and mutants!

Can you survive the horror? … a retro-style survival horror game developed by the two-man indie team of Gonzossm and Iggy Zuk. Survive 30 days and nights in a zombie-infested world by recruiting companions, upgrading weaponry and fortifying your position.

Hardcore open-world survival where preparation is everything. Scavenge, craft, fortify during the day. When night falls, the infected hunt in numbers. Play solo or with friends in a brutal post-apocalyptic sandbox where survival is earned through smart decisions. How many Nights will you survive?

Versus Squad is a fast action twin-stick shooter from the creator of Nation Red. Build your own sandbox defense and battle thousands of zombie mutants in top down combat! Face up to a dozen bosses. Simultaneously. Collect loot, build and repair. Play single player, on-line or local coop!

This is the world after a zombie apocalypse in which the main characters have to go through many perils. It is a story about ordinary people who, when faced with danger, decided not to run away from it, but to fight back. As the story goes along, you will learn what caused the disaster and help other survivors to overcome its aftermath.

The human race is in danger again. This time scientists could not cope the imminent threat and became monsters themselves. Crowds of zombie people filled the secret research base. The dreadful contagion is about to spread earth wide. Use the last chance to save the humanity from total annihilation!

Mist of the Undead is the perfect laid back shoot em up zombies game. Fight off endless rounds of zombies meanwhile upgrading your weapons to do serious damage. Speed around the map with the speed boost and super jump. Purchase armor, or don't, can you survive?

Build your base on a moving Machine, travel through biomes with different resources, and prepare for the night when a zombie threat is much higher than during the day. Would you go solo or explore this new world with your best friends?

Survivor Squad is a Strategy Action game where you control a Squad of up to four survivors and guide them through a highly randomized world looking for supplies to aid you on your journey.

Survive the zombie apocalypse with a “Final Fantasy” turn-based combat and permanent death! Manage survivors, craft materials, and make difficult decisions. Defend your camp against hordes of the undead to prevail in this non-linear rogue-lite (comparable to FTL). Innovative Indie Survival-RPG!