Although I do have to look in the below comments fro hints I am trying my best to figure these out and finding them very challenging but interesting at the same time... bookmarking and noting all ways to complete different tasks and learning lots along the way... so thank you ! :)

It's quite hard to solve the hash without online tools since maybe I used pure bruteforce instead of dictionary attack. Either way it's a good challenge. Great way to start

easier why to decrypt md5 hashes simply take the hash and search it directly on google!

i solved this!

can i solve this on MacOS?

can i solve this on MacOS?

H1 My write up for this room

Check-it-out: Link

that's fun , my first challenge

My very first RE. I loved that the flag was not given as a single piece. Nicely done. Thank you

which folder is the Java source code ? i have de-compiled and unzipped the apk then l was greeted with a lot of folder

Excellent! I learned to use 2 new online tools, one to decompile the api file and the other to decode the MD5 hash.

Thanks your hint

H1 My write up for this room

Check-it-out: Link

To be honest, this was best. Here's the hint: use apktool , dex-tools and jd-gui. Newbie you will surely enjoy this.