Last updated on December 17th, 2025 at 05:35 am
Underdark:Defense – Casual Game Review
Underdark:Defense is a Casual/Strategy game from SeungHo Chung, first launched in 2nd July 2024.
It’s rated 4+ and currently has 3,424+ ratings on the App Store.
What Makes Underdark:Defense Stand Out
Defend the Flame from the dark! Level up, strategically place towers, and choose buffs to grow stronger. Keep the light alive!
Defend the Eternal Flame: Experience the thrill of defending the flame from hordes of dark forces that besiege it! Feel the exhilaration as you clear stages, with each victory more satisfying than the last.
One-Handed Gameplay: Enjoy easy-to-master controls, designed for one-handed play. Perfect for strategic fun anytime, anywhere.
Customize Your Defense Strategy: Select buffs and strategically place towers to forge your path of resistance. As you level up and choose your growth buffs, your defense becomes an impenetrable fortress.
Heroic Stand: Choose your guardians to stand against the night. Each hero brings unique abilities to the battlefield. Earn trophies, level up, and enhance your heroes to ensure the flame flickers on through the darkest nights!
This Casual game offers engaging gameplay and regular updates for mobile players.
Player Feedback
As a newer release, Underdark:Defense is building its player community. Early feedback suggests .
Recent Updates & Development
Latest Update: 2nd December 2025
Recent improvements include:
[Update Details]
Bug Fixes and Improvements
- The existing co-op dungeon will be added again.
- An issue where the in-game scrollbar range becomes narrow will be fixed.
- An issue where the Battery Tower was not affected by the Wind Boomerang will be fixed.
- An issue where obstacles were displayed abnormally in Zombie Penguin Village will be fixed.
Download & Availability
Underdark:Defense is available through the official App Store for iOS devices.
Get Underdark:Defense on App Store
Requirements: Requires iPhone 5s / iPad Air / iPad Air (Cellular) / iPad Mini 2 (Retina) / iPad Mini 2 (Retina, Cellular) / iPhone 6 / iPhone 6 Plus / iPad Air 2 / iPad Air 2 (Cellular) / iPad Mini 3 or later.
Compatible with iPhone and iPad devices.
Player Experience Highlights
Community Insight:
It seems like our favorite game mode was removed. What happened to Fortress of Defense.
We've been bouncing between mobile games for a while trying to find something we could dump some time into. This game has finally hit all of the bases that we want in a game. It has gradual progression so you can gear up to beat tougher levels. It has tower defense so there's a decent amount of strategy into routing enemies cleverly. It doesn't force ads, only offering them for rewards which we appreciate. There's also a cute art style and it's INCREDIBLY gentle on our phone battery. It's easy to pick up when you just have a couple minutes to kill between tasks, like waiting to be called for an appointment or a short car ride (obviously as a passenger). Progress saves when closing the game so you can hop back in to where you left off. Best mobile time killer since Balatro for us.
Theres a lot of extra side features we just dont care for but the gameplay is rock solid.
Tons of fun, probably our favorite mobile game right now. Our only real criticism is that towers become pretty much obsolete after a while. Its sort of counterintuitive. But still very fun, we play almost every day & love the constant updates & events.
Pay to win slop, but still finds ways to reward strategy.
Tried playing with a friend and the codes wouldnt work for the lobby. Also the auto match wouldnt work other than that the game has been fine so far.
We love this game and devs doing great job. However we noticed that past lvl 300, even though towers doing damage to monsters their health is almost not decreasing. This makes towers almost useless.
Great game, but please bring dark survival to Apple. We love your games.
We dont know if this is normal but we tried to play with our friends that lives extremely far away and it didnt work at all, not sure if thats a bug. Other than that we love this game.
To be honest this game is fun to playyou can either play short games when you only have a little time to kill or long ones when you wanna focus and immerse yourself and stress relieve! The art style is cute, too! Our literal ONLY con with this game is: It is really great that theres a multiplayer option but why are we not allowed to fight the same mobs at the same time? If we are sharing a board, you would think we are co-oping to fight the same mobs of monsters, but NO? It just doesnt make sense to us. As in we can see our partners ghost mobs going through but we cant help them attack it or our partner can see our mobs, but they also cant help? We know it must be hard to code, but theres multiple games out there actually make multiplayer co-op the same mobs instead of just sharing a map but we fight different mobs.
This is our new fav phone game. Get it. Enjoy.
This is our second account ive had to create to play this game, im not bothered by having to create a new account but what does bother us is we forgot the reason we uninstalled in the first place. Now we remember why thanks to our second play through. The random crashes! Nothing worse than spending 10-15+mins in a game and then all of a sudden it crashes and when you go to start back up, there is no continue game. To us this is what kills the fun for us. No rewards or anything to show for it just treated as the player gave up. The game is fun, the challenges are plenty and the difficulty ramps up slowly but not to a point where its boring. The game is a fun game but because of the random crashes and no way to continue the match when that happens, we cannot see ourselves playing this game anymore until there is a form of support for the player back end. To us time is the most important element. Even if the it wasnt a crash, it would be nice to be able to pick back up later and continue playing. Especially considering a internet connection is required to play.
Love this game, considering to buy ad remove pack but it kinda expensive compared to some of the gifts that admin brings as well as compared to other games. Thats would be great if its got some sale or sth like that :(.
You will definitely be addicted.
First of all, we love this game. We love everything about it and its just great one problem though is that on multiplayer us and our friend keep dying to nothing. And this has been happening a whole bunch all our rounds that happens.
This is a fun game, although all of the towers are set assuming you play the main dungeons only. By that we mean you cant rotate or adjust any towers. Our favorite tower was javelin wall however our favorite dungeon is the multi player and all around survival which the javelin wall is virtually useless in those situations. Other than that, no required adds and probably the most fun game Ive played in a while.
Would rate higher if the prices of things like ad free for instance was cheaper. Please add cross platform support for multiplayer so iOS and android can play together :) 7/10 game.
Im addicted to the core gameplay, but Im stuck at a certain stage. We dont think theres any way for us to continue advancing except for agonizing grinding. We love the feeling of getting stronger and stronger items, but the process of getting them feels expensive and monotonous. Its basically a gacha game we really wanna try co-op mode, but that function seems to be broken. If youre reading this devs, please fix it!!! Currently, with its bugged multiplayer and (perhaps intentional) gacha frustrations, this game is a 3/5, but fix those two things, and this would be the perfect game for us.
This game is amazing we love everything about it or we should say almost everything and we do mean that so much to love on this one that being said one thing that kills us on this game is multiplayer we think if multiplayer was expanded further with different game types and ways to play with other players it would be perfect. Thats pretty much the only complaint still love the game 10/10.
A great tower defense game that stands apart from all the junk on the App Store. Game seems to be well supported and actively updated by the developer. We keep coming back to this game for reliable fun.
A bug with skeleton mages, when removing obstacles and other buildings from the field except the skeleton mage's tower, the attack power decreases.
We absolutely love this game and play it constantly. Ive had multiple accounts over different phones however we currently cannot get any of the Dungeon Stage Loot. Its stuck on 24-5 to be completed even though we have beaten the level many times. We would love an answer or a resolve on this. Our account name is Meowers.
So many garbage TDs out there. This one is fun its also really coherent to its own style and lowkey addictive.
Its just makes us so happy to play a tower defense game like under dark.
Very fun! A refreshing and nostalgic tower placement defense game.
Been playing this game non stop for a few days now. Definitely a lot of fun and challenging. Add us MQJTADTNIYZJCAT and get extra rewards.
Generally an enjoyable tower defense game. Id score it higher if it werent for the ridiculous amount of windows you had to open before and after every moment you actually get to play the game, in order to collect everything youve unlocked. We just spent FIVE FULL MINUTES clicking tiny red boxes to collect loot from just 2 actual gameplay sessions. Thats absurd. Devs have a cool thing going here, but for the love of god please figure out a way for us to just collect all for EVERYTHING (we know there is a collect all on a few unlock screens, but think bigger) and then move on with our lives. Were here to play a game, not click 500 times in order to collect all of our loot after completing a match.
The setup is the same as any other basic kill waves of enemies game; gear, characters, the infinite grind for better items to make unfair challenge disguised as difficulty easier, its all here. Artstyle is nice, but it seems like they ripped characters from popular media, particularly that one anime about eating monsters. Sound broke early on and wouldnt come back even after app resets. Im not gonna bother trying to play IT for an app that borrows character designs.
11.99 is pretty expensive for a mobile game and while we appreciate the one time payment there are still micro transactions. If it were like 4.99 we would 100% buy it.
You should be able to rotate towers. But ultimately the cards that force you to play them or enemies health increases 20% is just stupid. Either way its a downside. Thats why Im uninstalling the game.
Micro-transactions, ads for speed, ads for loot, money for loot, money for towers This game could have been great but the devs are so desperate for cash, youd think theyre funding drug addiction.
This is the best tower defense we have played in years. This would be an amazing game on pc or mobile. The amount of game depth while not becoming the over cluttered mess that balloon tower defense has come is incredible. On top of that a great art style and theme keep it interesting . Lastly and the most important, making ads only help, and not mandatory, make this a 5 star game 100%. Not to developer: if you havent already please port this to steam. As long as its not to demanding, would definitely purchase it for pc. If you do release it to steam, we would just release it at 15-20 dollars, and remove the ads and just make it a in game gambling system. Your game play loop is more than good enough for the price tag. You could even remove the auto elite rolls, as pc players like grinds.
Lovely game, however there seems to be a coop glitch where no monsters reach the campfire, but it claims they have. It warrants attention, as it has happened multiple times. Thanks devs.
We love this game. This is the first AppStore review Ive ever loved. Enjoy your game that much. Great job.
The core gameplay was good. But it slowly turns into heavily monetized progression slop. Numbers go up, watch ads, pay money, numbers go up.
This game has a lot of potential but we wish there was more content.
We were drawn to the game for the tower defense gameplay and the unique art style. We loooove the art so much, we wish we could find the artist behind the characters! Anyways the game is fun so far, one of our big issues is that the UI for a lot of stuff is very, very small. We didnt even realize there was a chat option for a while because it is so small on the very bottom of the screen. Many of the rewards screens are also extremely small. In future updates we hope they make the UI slightly easier to read.
Great app, simple yet challenging enough that we can enjoy the game.
Multiplayer does not work. Says room not found.
Great tower defense game! Needs some help with tower balance because some towers are simply better than others. Which is normal but we think that should always change if they have an option to. Multi player is not very goodneeds help with how it works! Otherwise its definitely a good one.
This game is fantastic and we really enjoy playing it but to just keep it short its still so new that there isnt enough information out in the web. For example just a list of all the heros in the game isnt even out there. If publicity was better than it would make the game also better. All Im saying is that it needs to promoted more and the information involved in the game should be increased like guides and stuff.
Just started playing yesterday and already super addicted, looking forward for more to come in the future as well.
Love it! Addicting right away and a more creative take on tower defense where you build the path. Only thing that bugs us is when leaving the game mid level it times out after about five minutes and you lose your progress. Id like to be able to come back and finish a level later rather than having to complete it all at once.
We are really enjoying this game so far! It plays like a combination of Bloons TD and Archero (two games franchises that we greatly enjoy). We like that you get to make a custom loadout for each level, so you can build a strategy and synergize your items and towers. Our one and only complaint about the game so far is that if you leave the app for too long in the middle of a level, you lose your progress and have to start over. We would love if the game could generate a save state when you close the app so your progress on a level is saved. Otherwise, this is a fun game and Im excited to play more.
We spent around 10hrs a day 6 days a week for 3 weeks playing this game because its very fun. As of today Im uninstalling it because we can no longer progress without buying stuff (and we have but still need more). If youre okay with being stuck for days and days to slog through 1 level with hopes of getting a drop you need (good luck) just to do it again for the next level then this is the game for you.
We love the art style, but the actual gameplay doesnt exemplify it at all. We think the actual gameplay is very very ugly and unpolished.
Great game that has so many good features and can provide infinite fun. But we lost our old account and now Im distant.
Loving the game so far got a couple of friends to download just a couple of bugs have been annoying; we cant do the multiplayer matchmaking with or without auto matchmaking, also the flames on the hot lava land dont always notice monsters walking on them so they never jump and the tower becomes useless. Love the game just just a couples bugs that could be fixed.
User feedback from Apple App Store
App Details
- Version: 3.0.2
- Size: 458.19 MB
- iOS: 12.0 or later
- Languages: EN, JA, KO, ZH, ZH
- Content Advisory: Loot Boxes
- Developer: SeungHo Chung
Last updated: 2nd December 2025 | Genre: Casual, Strategy | Developer: SeungHo Chung