You don't have to wait until Halloween to enjoy a good horror game. And when it comes to zombies, the undead are bound to pop up at any time of the year. From cartoon-styled casual games to realistic first-person shooters, here are eight great mobile zombie games to test your survival skills.

1. Plants vs. Zombies

If you have never heard of Plants vs. Zombies, then you're missing out. This fun, tower-defense game is great for adults as well as kids ages 10 and above. Your goal is to keep those crazy zombies from invading your space. But to do so, you must fill your soil with plants that take out the undead.

You have a limited amount of seeds, so plan (and plant) carefully. And, each unique zombie will bring a twist to your plans with its special skills. Check out the in-game almanac for help in planting the right zombie-zappers, earn helpful items as you progress, collect coins for power-ups, and protect your dwelling at all costs.

If you enjoy the original Plants vs. Zombies, you can also try out Plants vs. Zombies 2 and Plants vs. Zombies Heroes. All games in the series are free with in-app purchases for game items.

Download: Plants vs. Zombies on Android | iOS

2. Zombie Catchers

If you're brave enough to capture the undead instead of destroying them, Zombie Catchers will put your valor to the test. Locate and lure the zombies, use your weapons and gadgets, and build a business empire with tasty zombie juice. Why not make a buck while you save the world, right?

Zombie Catchers is a platform action game with a colorful cartoon theme and just enough of a challenge. As you roam the land, capture the zombies who are invading the planet and they become available in your lab. Then, squeeze those creepy characters to create juice, level up, unlock more items, and build a thriving business.

Download: Zombie Catchers on Android | iOS

3. Stupid Zombies

Some love it, some hate it, but no matter which side you're on, Stupid Zombies belongs on this list. With superb aiming and effective ricochets, you must take out the zombies around you. Use grenades, buck shots, and other helpful items to help you progress through the hundreds of levels.

You have limited ammo in each level, so finding the right angle is key to take out as many zombies as you can per shot. Beware of tricky obstacles, use boards and explosives to your advantage, and don't give up because, after all, those zombies really are stupid.

You can also check out Stupid Zombies 2 and Stupid Zombies 3 if you enjoy the first one.

Download: Stupid Zombies on Android | iOS

4. Zombie Tsunami

It's your turn to be the zombie and take the world by storm. In Zombie Tsunami, you gobble up pedestrians and transform them into zombies who become part of your team. The bigger your zombie squad, the more powerful you become. Flip over cars, take out airplanes, and race to destroy anything in your way.

Zombie Tsunami offers hundreds of missions, 11 environments, and awesome upgrades and bonuses. The game is easy to pick up and play, the claymation graphics are stellar, and you can even eat your friends by connecting to Facebook.

Download: Zombie Tsunami on Android | iOS

5. Into the Dead

If serious zombie takedowns are more your style, then step Into the Dead. The world has been invaded and the zombie apocalypse has begun. You must run, defend yourself, complete missions, and most of all, you must stay alive.

Into the Dead has intense and challenging gameplay with both audio and visual effects that make the game dynamic. Stay alive and unlock additional weapons and items to help you survive longer.

Note that the game is intended for mature audiences, ages 17 and above. So, for spooky but fun games for your kids, check out some child-friendly options.

Download: Into the Dead on Android | iOS

6. The Walking Dead: Season One

You don't have to be a fan of the comic books or television series to enjoy the game adaptation The Walking Dead: Season One. You just have to be ready to do whatever it takes to survive. This first in the game series takes you into the world of Deputy Sheriff Rick Grimes, but you decide what happens next.

This is a decision-based game where your choices change the story. Run, fight, hide, and meet others just like you. Then, take on the next episodes from within the game and check out follow-ups like The Walking Dead: Michonne.

Download: The Walking Dead on Android | iOS

7. Dead Effect 2

For first-person shooter fans who are ready to take out chilling undead creatures comes Dead Effect 2. In this sci-fi, story-based challenge, you must complete objectives while armed against the enemy in a terrifying futuristic world.

Scan and explore the spaceship, collect weapons and ammo, complete the missions, and beware of the dangers that lurk around every corner. With amazing graphics and audio, an engaging storyline, powerful weapons, and epic boss fights, you will definitely get sucked into Dead Effect 2.

Download: Dead Effect 2 on Android | iOS [No Longer Available]

8. Dead Target

One final zombie apocalypse game to get your heart pumping is Dead Target. Similar to Dead Effect 2, this is another first-person shooter with a futuristic theme. Each zombie you encounter in Dead Target is distinctive and dangerous in its own way.

Arm yourself with multiple weapons from a rifle to a grenade launcher. Use cool combat moves, unlock more guns, and upgrade so that you can handle the zombie waves. Dead Target offers excellent 3D graphics, responsive gameplay, and more than enough zombies to keep you busy for a long time -- assuming you survive.

Download: Dead Target on Android | iOS

Take Aim and Take Out the Undead

Some of these games are new and others are older. But, one thing that they all have in common (besides the zombies of course) is that they are all fun to play. Grab your weapon, strap on your gear, and prepare to survive against the undead.

Do you have a favorite mobile zombie game that we missed? There are a lot of them out there, so be sure to share your suggestions with us in the comments below!