- Update for Unity security vulnerability (v1.24) - 5 October 2025
As already reported in the news, security vulnerability has been discovered in Unity game engine. Since this game also uses Unity, we have replaced the objects with clean-built ones using security-patched Unity (2022.3.62f2). Additionally, we performed the following maintenance to reduce file size and mitigate future security risks. Removal of unused Unity packages Update to latest version of Steam API (Steamworks.NET)
- Participating in Steam Turn-Based RPG Fest 2024! - 30 September 2024
This game "Underground Defense Force" (UDF) is participating in Turn-Based RPG Fest! We hope you'll take this opportunity to pick up if you are interested! https://store.steampowered.com/app/2603860
- English translation for story texts (v1.22 => v1.23) - 31 August 2024
Following the previous update (see below), proceeded to translate the untranslated texts into English. https://store.steampowered.com/news/app/2603860/view/4599951478185432388 With this update, the story (in message window) and end roll are now available in English. The remaining is the summary text for weapons, armors, and missions. However, due to the volume of text, the number of characters limit of the UI, and the Japanese-unique content that is difficult to translate (*), we may not be able to proceed the translation soon. (*) For example, "Love" in Japanese language (= Kanji letter "愛") and "Mana" are read the same in Japanese, as they explained in this game. In English, "Love" and "Mana" are completely different each other, so simply translating them as they are does not make sense!! However, in addition to the fact that it would be beneficial to Yakuentei, the creator of this ga…
- Some remaining English translation (v1.21 => v1.22) - 28 August 2024
Some untranslated texts were translated into English. (Message windows in Mission 20, 27, 34, 37, 38.) On the next update, mission 39, 40, and end rolls will be translated. Overview texts for equipments (weapons/armors) and missions will be further later. Please note that due to the fact that this is an individual development indie game, I cannot guarantee that I will actually be able to proceed with the English translation, including determining the specific schedule. However, I will make my best efforts. Thank you for your understanding.
- Released a SLG bundle in collaboration with Flying Panjandrum! - 13 August 2024
In collaboration with Flying Panjandrum, whose motto is to create "unserious but serious" games, we have released a SLG bundle! This unserious but serious title, "Underground Defense Force", is also included in this bundle, giving a 20% discount on the total of the three works. Even if you already own one or several of the titles, you can complete remaining titles for 20% OFF the total price of the unowned titles only, so those interested are encouraged to take advantage of this bundle! https://store.steampowered.com/bundle/43990 Note: Total amount displayed before adding to cart The total amount of this bundle displayed on Steam may NOT be subtracting the amount of items already purchased, but rather showing a higher amount that is the sum of all items. Once you add this bundle to your cart, they should be subtracted correctly. So, please confirm that the total amount is as intended be…
- Added "Open Save Folder" menu (v1.2 => v1.21) - 23 July 2024
Added "Open Save Folder" menu to Option screen. If time permits, we would like to support multiple saved data files in a future update. For now, we have tentatively added the menu to open the location of the folder where the saved data file is stored on the Option screen using Explorer or other programs. Please note that, as the note on the screen indicates, if you do not temporarily turn OFF the Steam Cloud setting, your deleted or overwritten save files will be restored by Steam Client. (You can turn ON or OFF the Steam Cloud settings by opening "Properties ..." from the right-click menu of this game on your Steam Client.)
- New Difficulty Level "IMPOSSIBLE" formal released! - 17 July 2024
A new difficulty level "IMPOSSIBLE" which can only be challenged by players who have completed INFERNO, has been released formally and now available as v1.2! If you have already played IMPOSSIBLE level in beta branch, as described in previous announcement (below), please change the "Beta Participate" field back to "None". https://store.steampowered.com/news/app/2603860/view/4220517501581638441 Note that, I, the author of this game, have confirmed that all the missions can be accomplished by myself, so the game balance is NOT unchanged from the previous beta version (v1.2beta2). Some of the missions may have become so unreasonable that they can only be completed by using very “unfair” methods, but to live up to the “IMPOSSIBLE” name, I left them as they are!!!! Summary of IMPOSSIBLE difficulty Unlocked after completing all INFERNO missions. (Same condition as the Lv99 strongest weapon. I…
- IMPOSSIBLE (beta) is now even more difficult! (v1.2beta2) - 15 July 2024
This update is to the beta branch of IMPOSSIBLE difficulty, as described in the previous announcement (below). https://store.steampowered.com/news/app/2603860/view/4220517501581638441 Changes (v1.2beta => v1.2beta2) The IMPOSSIBLE game balance has become even more difficult and formidable! Changed IMPOSSIBLE Damage Deal Variance from +/- 20% to +/- 5%. Increased all IMPOSSIBLE enemies' Health except boss monsters. List of IMPOSSIBLE enemies' Health (from old to new) Ant 2184 => 2974 Spider 2496 => 3411 Hornet 1456 => 1892 Cockroach 2704 => 3411 Moth 2704 => 5699 Woollybear 3120 => 3785 Caterpillar 2704 => 3785 Firefly 3120 => 3785 Burrow 4784 => 5699 Arachne 4784 => 5699 Chrysalis 4784 => 5699 Mantis 3120 => 3785 Centipede 2704 => 3411 Snail 9568 => 11398 Beetle 5720 => 6011 Scorpion 1456 => 1892 In addition to the increase in the enemy's Health, the damage variance has been narrowed, m…
- New Difficulty Level "IMPOSSIBLE" has been pre-released in beta branch! - 5 July 2024
A new difficulty level "IMPOSSIBLE" which can only be challenged by players who have completed INFERNO, will be officially released at the next update. Currently, in the process of adjusting the balance, and not fully tested, but decided to release it tentatively as a beta branch (* see below) for those who want to try it out even if the game is unstable. I, the author of this game, am adjusting the game balance during test play, so there is a possibility that the game will become more difficult or easier before formal release. Please understand it. If you have played this beta version and have any comments/suggestions, I'd appreciate your feedback in the reply section of this announcement, on the community bulletin board, or on Twitter, etc. Summary of the new difficulty: IMPOSSIBLE Unlocked after completing all INFERNO missions. (Same condition as the Lv99 strongest weapon. If you hav…
- Participating in Steam Summer Sale! - 27 June 2024
Yakuentei's indie games (including this game) are participating in Steam Summer Sale! We hope you'll take this opportunity to pick up if you are interested! https://store.steampowered.com/app/2603860 https://store.steampowered.com/app/2166220 https://store.steampowered.com/app/2083960 Note that, due to Steam rules, we were unable to participate in the Summer Sale for the DLC of "Students of Light Bonds" because one month has not passed since the launch discount. We think we'd like to participate from the next sale, so please stay tuned! https://store.steampowered.com/app/3001140
- A small change of NPC's AI algorithm (v1.12 => v1.13) - 8 June 2024
Modified the NPC's AI algorithm so that friendly-fireable weapons/magics are used even when there are only ally units around. This update only affects the AI algorithm of the NPC Mage Infantly who uses the suicide spell "Manner Mode α" in the Mission 13 "Recital of Mana". Until v1.12, it was possible to stop him from using "Manner Mode α" by defeating all insects around him. From v1.13, even if there are only allies around him (even if it only hits himself!!), he has become an extremely dangerous presence that will "self-destruct" without any questions asked! "I'M GOING TO DIE ANYWAY! YOU ARE ALL GOING WITH ME!" "I'M NOT AFRAID! I'VE GOT NOTHING LEFT TO LOOOOOSE!!" What? You really want to stop him from blowing himself up? For those of you who do, I recommend a method also known in the homaged original game (= "Ea*th Defense Force" series), "Mine-Uchi"! (= Killing NPCs before they do an…
- Added "READY" blink (v1.11 => v1.12) - 4 June 2024
Added "READY" blink notifications before starting each wave when "Viewed Event" setting is "View" (including when the mission has not been accomplished). This feature was made to prevent accidental misfiring of weapons with friendly fire (e.g., "Blast/Multi-Cast" magics) while repeatedly clicking the mouse to skip the message window. Unfortunately, the request to eliminate friendly fire itself is "rejected". Because, even in the homaged original game (= "Ea*th Defense Force" series), it is a "promise" that "Rocket Launcher", "Thunder Bow", etc. will hit friendly NPCs directly, and you yourself will be killed by a single hit!! Separate post: Seeking information about permanent Emergency Charge bug As posted in Steam Community (below URL), I, the author of this game, am looking for information on the Emergency Charge persistence bug. This is a very rare phenomenon, and I have never encoun…
- Bug Fix (v1.1 => v1.11) - 17 May 2024
Fixed a bug that caused the final mission to be treated as a win, even if all the player characters were wiped out. Found a very frivolous bug. My apologies ... (Since it is obviously a "player advantage" bug, so I may be offended by fixing it ...) The version under development (at the time of closed test play) was working correctly, but somehow I made a strange modification to the victory conditions, causing it to "degradation". My apologies.
- Added the blur option for "cockroaches" - 15 May 2024
We have completed the implementation of "Blur Cockroaches" as announced in yesterday's news! https://store.steampowered.com/news/app/2603860/view/4209254069393094342 If you don't want to see cockroaches as they are, let's try switching the "Blur Cockroaches" to "ON" in the "UDF HQ" menu!
- Planning to add the blur option for "cockroaches" - 14 May 2024
I, the author of this game, am happy to see various reactions on SNS such as X (Twitter)! Now, we have received comments from some Japanese users that it is painful to see the "cockroaches", or at least an option to apply blur to them, or etc. Therefore, we are now planning to add the blur option like as following screenshot. If possible, it may be more flexible to blur other insects as well, but we believe there are many people (especially Japanese) who "just do not like cockroaches", so we will focus on supporting "cockroaches only" and will work to provide an update as soon as possible. Thank you!
- UDF! UDF!! New SRPG "Underground Defense Force" has just been released! - 13 May 2024
UDF! UDF!! Yakuentei's new work SRPG "Underground Defense Force -Sword and Sorcery and Swarm of Insects-" has just been released! Offering a launch discount (10%) for two weeks starting today! Let's beat giant swarm of insects! Get XP and weapons as rewards! And, reinforce your own party members customized by you with changing avater items! For those who love to "farm" items ... In this game, the highest difficulty levels, HARDEST and INFERNO, are unlocked after accomplished mission 4 in the early stages of the game. For those who love to farm items, I, the author of this game, have created an "official spoiler video" that summarizes how to clear an INFERNO stage with only the weapons and armors available mission 1 to 4 of HARD and immediately get a strong weapon. It is NOT recommend the spoiler method of this video to those who want to play normally, as it will destroy the game experie…
