This is a collection of hints for all the problems in the recently conducted Capture The Flag (CTF) contest conducted by SDSLabs as a way to get n00bs (beginners) to have a taste of the beautiful world of hacking. It was a pretty fun contest even though it was quite easy.
Test 
Use a SHA256 tool. My favourite is to just search for "SHA256 STRING_TO_BE_SHA256" on my default search engine (www.duckduckgo.com) 
Location-51 
There is a redirect occuring here from http://hack.bckdr.in/LOCATION-51/index.html to http://hack.bckdr.in/LOCATION-51/trap.html Stop this redirect, and read the source of index.html The javascript there gives away the flag 
Hidden flag - Easy 
Using the 
file linux command, we find out that it is an ELF binary, but running it gives nothing. However, running 
strings on it gives away the flag. 
Search 
The zip file contains a .txt file which does not seem normal text, so we run a file on it. This says that it is jpeg, so change it to .jpg and open it. It is a QR code. Decode this using some online tool (just search for "QR code decode online" for a large number of free tools) and get a link. The link has the flag. 
Lost 
The message says Console, so open up console in Firefox. The message then tells you to POST data to a link. Going to this link directly does nothing, but sending it any random POST data (using HackBar addon in Firefox for example) gives the flag. 
Hidden flag - Medium 
Analyzing the file with IDA Pro shows that there is a function called 
print_flags() which is not called inside 
main(). Running this function should print the flag. We can do this by attaching 
gdb to the binary, breaking the execution and running the 
print_flags() function. 
Clutter 
Extracting the file and analyzing with Wireshark shows that there is too much to work with. But exporting all the files and then running 
strings on it would probably work. However, filtering this is a pain, so I just ran a 
grep for flag and the answer will be visible near a pastebin title. 
No - Signal 
Use GIMP or Photoshop to add the images. The flag should be obvious then. 
Sound 
Slow down and reverse the sound wave using Audacity. Listen to it and it should be obvious what the flag is. 
Sequel 
Looking at the code, it seems like a SQL injection can be done here. Downloading the database.sdb file and rewriting the source code to start throwing data from database, you realize that there is no user sdslabs in the database. This makes it obvious that you need to add the user. The following username virtually that: 
' UNION SELECT 'sdslabs','sdslabs','sdslabs','sdslabs','0c4ea8f5b344600f78516334254e9e085f2225a42a0bb18fa8bd774589f1ca19' UNION SELECT * FROM users WHERE '0'='1. Note that this query will not work directly, the password will have to be set accordingly. 
Undisputed 
The file is a ext4 filesystem (use 
file command if you don't trust the extension). Mount this in linux using the 
mount command (read 
man mount to know how) and then open the file inside to see the flag.
Did you find any other cool/new ways of solving any of these tasks? If so, leave a comment below. 
Link to writeup for n00b16ctf