302 words
2 minutes
lactf{2025}
LACTF 2025
Danger Searching
# DescMy friend told me that they hiked on a trail that had 4 warning signs at the trailhead: Hazardous cliff, falling rocks, flash flood, AND strong currents! Could you tell me where they went? They did hint that these signs were posted on a public hawaiian hiking trail.
Note: the intended location has all 4 signs in the same spot. It is 4 permanent distinct signs - not 4 warnings on one sign or on a whiteboard.
Note: Feel free to try multiple plus codes. The answer skews roughly one "plus code tile" south/west of where many people think it is.
Flag is the full 10 digit [plus code](https://plus.codes/map) **containing the signs they are mentioning**, (e.g. lactf{85633HC3+9X} would be the flag for Bruin Bear Statue at UCLA). The plus code is in the URL when you select a location, or click the `^` at the bottom of the screen next to the short plus code to get the full length one. If your plus code contains 3 digits after the plus sign, zoom out and try selecting again.Flag: ||lactf{73G66738+9C}||
Intended solution:
- You can find the list of
public trailsinhawaiiin https://hawaiitrails.ehawaii.gov/trails/#/ where it allow you to filter the trails based on thewarning of the trails, and if you put all4 of the warning given, it shows only1 trailwith all of the warnings, which isPololu trialand you can find theplus codefrom using the address.

Unintended Solution:
- Search for
hawaiian hiking trail 4 danger signs - Found exact 4 title signs

- Found the
locationandcoordinatesongoogle maps street view

- Copy the
Plus Code

- After do some digging about
Plus Code 10 digits, I found out that you can get the first4 digitsfrom https://plus.codes/map

PRO TIP: You can guess the
last 2 digits… for more accuracy73G66738+XX
VOILA
lactf{2025}
https://fuwari.vercel.app/posts/lactf-2025/