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!

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.

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!

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.

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?

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?

7 Days to Die is an open-world game that is a unique combination of first-person shooter, survival horror, tower defense, and role-playing games. Play the definitive zombie survival sandbox RPG that came first. Navezgane awaits!

Like a dead man reanimated by dark sorcery, the necromancer simulator is back! Give the undead the ability to fly over mountains and swim across rivers, explore a fully generated world at night and fend off enemy hordes during the day. Start a new, uhm, life.

Build your towers and let them do the killing! Connect 12 unique towers through the Reactor to discover 144 devastating synergies. Kill endless zombie hordes, mutate them for bigger rewards, and push your build to the limit in a chaotic bullet hell.

This is a multiplayer cooperative open world construction survival sandbox game, where you and your friends must find supplies and build shelters in this world. You have to keep an eye on your character's needs state at all times, a bad state is likely to lead to death.

Defend. Upgrade. Dominate. A relaxing incremental base-defense game, packed with powerful skills and a deep skill tree.

The Front is a survival open-world crafting sandbox game. You are a resistance fighter sent back in time to stop the rise of a tyrannical empire. Collect resources, craft tech, build shelters, and fight monsters to accomplish your mission.

Jump into a realtime strategy, action filled battlefield, deploy relentless soldiers, unlock powerful troops and vehicles, upgrade your army, decimate the enemy. If that's not enough, jump into a chaotic Zombie mode, with traps, fun upgrades, and a new gameplay!

DOOM SWEEPER is a 2D pixel-style game. Clean up the approaching zombie climax, and exchange it for cash, embarking on a journey to become an arms dealer in the apocalypse. Complete the game, unlock more items in the shop, and achieve various achievements to obtain different CG!

From Glory To Goo is a Sci-Fi survival RTS set on an alien world. Serve as humanity's bulwark by establishing a colony and supporting your colonists still in orbit. But beware, for The Goo, a relentless and shape-shifting force approaches from all sides, even above and below.

Choose any real region from the world. Choose your base of operations, then rebuild and readapt the buildings around you to create a self-sustaining settlement. Take charge of a group of survivors from your city. And when the night falls - Defend the zone from the infected!

Cluckmech Oasis, a top-down shooting Roguelike tower defense game. Play as the Warcluck and lead your team of animal heroes in a fight for survival. Collect, build and upgrade defenses, and engage in intense battle against waves of plant enemies.

Apocalypse Party is a 3D top-down action Roguelike game. In this game, you will embark on a new mission to traverse through the Middle Ages and gradually master abilities, and arm yourself to become the strongest survivor through numerous choices.

Limsod is an FPS set in a post-apocalyptic universe in which you must fight for survival in a world infested with flesh-eating zombies. Upgrade your equipment and play in a variety of maps and game modes.

Night Raider is a thrilling adventure exploration shooter game. Players need to carry weapons into the city occupied by zombies, as far as possible in various buildings to collect necessary supplies, evacuate alive to bring supplies back to the camp. But you have to face are not just zombies...

Terminus: Zombie Survivors is a 2D turn-based survival roguelike set during a zombie apocalypse. Each journey is unique, and every decision can mean the difference between life and death. Can you brave hunger, cold, and the undead in order to reach the Terminus and find salvation?

Collect resources and establish a defense line before dark And then Facing countless enemies

The Horde is coming, but you're ready to fight it! Assemble your squad, choose their upgrades, and build powerful synergies against thousands of undead. Survive. Then evolve. Then break every limit in this deceptively simple but addictive bullet heaven game.

Build twisting mazes with tetromino blocks and deploy unique towers in this strategic roguelite tower defense adventure!

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.

Dead Rising returns with modern graphics in this Deluxe Remaster!

A defense RTS where you can move turrets at will. Extract resources, upgrade technology, and defend against enemy swarms in a gripping space campaign. Hold the line, set up your turrets, and brace for screen-filling hordes!

HumanitZ is an isometric, open-world sandbox survival game set in a world ended by a zombie outbreak. Survive alone or with friends by scavenging, crafting, building, and fighting to last as long as ‘humanly’ possible. You can’t change the past, but you can fight for the future of humanity.

FatalZone is an auto shooter with roguelike and RPG elements set in a savage world of zombies. Exterminate zombie hordes, collect resources, upgrade your camp, and level up mercenaries. Humanity must survive at any cost!

The open-world survival role-playing game "Bad 2 Bad: Apocalypse" tells the story of Delta Team and his comrades as they work to rebuild a world devastated by humans and their race turned into zombies.

Build and design the terrain while defending your stronghold against alien invasion in this unique Roguelike tower defense. Choose from 30 heroes, survive enemy waves, and upgrade a variety of destructive towers to hold the line!

Only the paranoid survive, build your defenses and prepare to take on hordes of infected while protecting the trader.

Shoot hordes of zombies in a bullet hell roguelite arena. By day, harvest resources, unlock map areas, and prepare for the upcoming night. Craft unique strategies by combining characters, weapons, and exploring a vast ability tree.

No More Room in Hell 2 is an intense 8 player zombie shooter. Overcome the endless undead. Avoid infection. Survive hell together.

The insect swarm is a swarm consists of millions of alien insects, and you, as the only survival on this barren planet, will have to fight against them dauntlessly. Good luck!

"Last Remains" is a highly challenging multiplayer zombie survival game. Players must survive in a city overrun by the undead, scavenging for food, arming themselves, avoiding zombies, searching for loot, plundering other survivors, and finding any possible way to escape.

Diplomacy is Not an Option is a strategy game set in a medieval fantasy world. Build your town and defenses, raise huge armies and fight against massive hordes of enemies. How long can you survive?

Defend humanity's last hope, pilot a powerful mech, in Frontlines Crisis! A battlefield swarming with insects makes strategic and combat decisions crucial. Each decision will determine your fate. Defend humanity's last sanctuary, fight fiercely, and uphold human honor with wits and courage!

Hexguardian is a roguelite, tower defense game where you build your own maps with hexagonal tiles! Build and upgrade towers, recruit armies, learn spells, construct wonders and place hexagonal tiles to create a path to enhance your defenses. With plenty of game modes and talents to unlock!

Hard-core action with easy controls! The METAL SLUG we all love is back as a tower defense game!

A fast-paced, wave-based zombie shooter set in an alternate 1980s dystopia. Call in airstrikes, deploy support bots, upgrade wild weapons, and survive the horde—solo or with friends. No grinding. No paid DLC. Just pure, chaotic fun.

A short first person wave defense surrounding mutant creatures invading your town. Collect materials and fire power from the hardware and gun store, build traps to defend yourself, and survive 6 nights. Comes with Unreal Engine 5 project files.

A Single and cooperative game for 4 players, you are a fighter of a special purpose unit, your task is to destroy waves of zombies by taking convenient positions and using tactic

A short incremental siege game centered around growing and strengthening an army to defend your kingdom. Seize the crown from an endless wave of enemies for your best chance at survival!

Survive the apocalypse with friends in Escape Z. Fight and plan tactics to face hordes of zombies. Choose your character, map and prepare. Survival is your only option.

Hellbreach: Vegas is a Wave-based First-Person Shooter for 1-4 players, made with passion by a one man dev team! Set your loadout, kill, and earn cash. Take a spin on the various slot machines and level up to improve your survival chances. Are you ready to try your luck?

You have been transported to a procedurally generated voxel world where every decision matters. Manage resources, fight zombies and prepare for the harsh winters. Survive, build and thrive in an environment full of challenges and discoveries.

Command Mobile Outpost and take XEN Firearm to venture deep into the Signet surveillance off-limit area. Collect unique Weapon Units. Amp up the firepower of the Outpost that fights with you. This is an FTD game - FPS, Tower Defense, Base Building and much more all at the same time.

Something has gone terribly wrong in TRAPPED Alaska. Except for you, and a handful of survivors, the whole town has been emptied. Everywhere, what should be water has been replaced by a black semi-sentient sludge that seems to change everything it touches. And it’s rising...

in REDDOOR the player must survive against endless rounds of the undead, opening and clearing doors and using weapons, perks, utilities, and Power-Ups to their advantage to survive.

Paradise isn't exactly what you hoped for: it's infested with zombies! Thankfully, you can control them. Capture them and teach them to farm or fight. They will help you defend our camp while you explore the world looking for… a new paradise.

X Invader is an action roguelite where you hack into big corporations' servers. Use add-ons from fellow hackers to defeat monsters. Powerful, cute bosses guard these servers!

A roguelite horde-survival bullet heaven with QUINTILLIONS of bullets over QUINTILLIONS of hordes. Mix weapons with items, modify, control chaos at terminals and break through tightening waves.

Mow down countless crops and corrupt critters while crafting game-breaking builds! Pesticide Not Required is an action roguelite bullet heaven game with farming sim elements that offers a myriad of stats and special character traits to create wildly diverse run possibilities.