Gamma

## Theft

We received a new email from Cole Johnson:

Phase 1 Recruits,

Congratulations to working together to solve the Phase challenge.

As an update on the ETAINVESTIGATION, with your help we've been able to pin down a location in the North Pacific Ocean where the Eta Fragment might be located. A team is en route to the location to setup a research site and we will update the entry and recruits once we have more.

In the meantime, unfortunately a theft occurred at one of our research sites last week and we're still trying to ascertain the scope of the damage. You've been given access to the relevant details in the database in record GAMMATHEFT.

As a reminder, each recruit may submit \*a\* question for Alexander to faq@aeternus.center (Founder Asked Questions) which will be answered on our internal site. The questions so far have been answered are available on the database.

Finally, as a reminder, there's a small commemorative reward for Phase 1 Recruits. Details at ALLFORONERECRUIT. There's even a bonus challenge involved, though while it can be solved alone, working with someone else might make it easier.

-Cole

which let to a new ID record:

**γ Incident**

Record ID: GAMMATHEFT

Last Update: Oct. 19, 2020, 10 a.m.

Filed by: cjohnson

An incident occurred last week at one of our research sites.

An item was discovered missing from the vault at the research site and our data logs were corrupted.

We could use your help piecing together what happened.

Any information you can find out would be useful.

The logs we have recovered are available at GAMMALOGS-101520.

### **The Logs**

The Gammalogs is a quite huge list of users entering and leaving rooms. Only the first few lines are shown below:

**10/15/20 Gamma Security Logs**

Record ID: GAMMALOGS-101520

Last Update: Oct. 16, 2020, midnight

Filed by: ???

Room ???:

T+00: User1348 passed the North sensor.

T+01: ??? passed the West sensor.

T+01: User1356 passed the North sensor.

T+02: User0123 passed the North sensor.

T+02: ??? passed the South sensor.

T+03: ??? passed the South sensor.

*and so on*

Room ???:

T+01: ??? passed the East sensor.

T+02: ??? passed the West sensor.

T+05: ??? passed the East sensor.

*and so on*

*and much more rooms*

Vault:

???

### **The Map**

One player gets another email which gave as another helpful Record ID: **GAMMAMAP**

**Redacted Gamma Site Map**

Record ID: GAMMAMAP

Last Update: Oct. 19, 2020, 5 p.m.

Filed by: cjohnson

### **Solution**

#### The basic rules

Each movement of a user will trigger to sensors:

1. The one in the room he leaves

2. The one in the room he enters

Each user enters first the room "Entrance" from the north.

Example:

Room Entrance: T+00: User1348 passed the North sensor.

This means **1348** enters the entrance room

Room Entrance: T+01: ??? passed the West sensor.

The ??? is User1348 since he is the only person in this room at this time and he leaves to the west. Now we need to search for a room where at the same time someone enters from the east. Here it is the next room which we now number as "1"

Room 1: T+01: ??? passed the East sensor.

and **1348** will now be in Room 1 (West of entrance)

### The rooms

One can reconstruct the layout of the rooms by following the movements of users for each time instance in a sequential way or (which is easier) by "puzzling" them together by comparing pairs (N-S, W-E) with the same times. Here the layout. Numbering as the rooms appear in the list, whereas Entrance = 0.

### **The Vault**

Again there are two basic ways to determine which user entered the vault:

1. Follow the motions of all users from entering till leaving (takes some hours ;-))

2. Look from which room someone entered the Vault (this is faster and easier, but detected too late ;-))

Taking approach 2 there are 4 possibilities for how to enter:

Room 29 South

Room 38 East

Room 48 North

Room 55 West

Looking into the list it is clear that only Room 55 has a sensor signal to the West.

Room 55:

T+16: ??? passed the South sensor.

T+17: ??? passed the West sensor.

T+18: ??? passed the West sensor.

T+19: ??? passed the North sensor.

T+26: ??? passed the South sensor.

T+27: ??? passed the North sensor

So someone entered from the south (room 54) at T+16, entered the Vault at T+17, and left it at T+18. By backtracking one could find that this is

**User1375**

This led to the Karla incident