Subscribe to download
Risk of Rain Challenge

Current Version: Release v5.8
Current Translation Version: v1.2
(Local installation's version can be checked via console at mission start by every player)

Due to a bug the game currently has, texts do not display properly most of the time if you do not have this addon installed.

Temporary fix:
Input the following command into the console:
This should immediately work if you were present when the challenge is enabled.
If you joined the lobby during mid-game, this will only work after map change/reload.

Permanent fix:
Install this addon.


A roguelike challenge where you take on a journey to defeat the Boss without restarting while collecting items that you can bring across maps to assist you.
There are over 57 unique items to collect!

(All progress is saved on whoever the host is. In the cases of listen servers, whoever is hosting will be the person that holds the saved data. In the cases of dedicated servers, they will be holding the saved data.)


In this challenge, the core gameplay remains the same, except all marines can hack, and biomasses can be ignited with explosions and flares.

Your goal is to prepare yourselves against the Boss that is required to be defeated for a win. Meanwhile, aliens will be dropping items with different rarities (common, uncommon, & legendary) that you can collect. Each of these items provide you perks that can assist you for the rest of your run. Check out the wiki below to learn more about every item.

Be sure to try to collect as many of them as possible, because aliens will grow stronger at an increasing rate! Aliens will become tougher to kill, as well as being able to deal more damage. This is where the collection of items comes in: They will be the reason you can compete with their non-linear growth!

ASBI spawn rules applied.


- ASBI spawn rules no longer apply.
- Item drop chance halved.
- Save file is global to the challenge.


Difficulty scaling is affected by time, stage number, player count, as well as the selected base difficulty.
The more time you spend on one stage, the more difficult the following stages will become.
It is up to the players to make sure they complete every stage as efficiently as possible: to spend as little time on every stage as possible while collecting as many items as possible.
Every completed map counts as a completed stage.
Player count counts the number of players, but will not count back down if any player leaves an ongoing run.
Selected difficulty will be locked and cannot be changed until the end of the run.

Increase in alien level makes aliens tougher to kill and deal more damage.

Every 5 stages count as a "loop."
On every fifth stage, a number of queens will spawn, with that number depending on the number of loops the players are at. Queens have higher chances to drop items of higher rarities.
Every fifth stage completed will increase the carnage level by 1.


Eliminating all queens on a stage will drop a Boss Key used to spawn the boss on the following stage. To use it, carry the Boss key to the end of the stage.
Completing the stage after defeating the boss will end the run with a victory.
Completing the stage without defeating the boss will continue the run.
Items do not drop on boss stages.


- English (default)
- 简体中文 - Simplified Chinese
- 繁體中文 - Traditional Chinese
- Русский - Russian - Provided by berry


https://steamproxy.net/sharedfiles/filedetails/?id=2987314558
This wiki page currently provides information on:
- HoIAF Scoring System for this Challenge
- All items
- All elite types
- The Boss
- Unique One-shot Protection