See a decoding web title, this title mainly on the discovery and identification of various source coding capabilities, such topics as the url decoding, base decoding. After the Go to view source code, I found a html page
Direct access, we found a large segment of the URL encoding.
Decryption got another period of base64 encoding
Continue to decode this base64 encoded, it has been another period of URL encoding
Again decoded some php code to directly access files obtained arrow pointing flag.
Development areas: url encoded and base64 encoded at some point
Webmaster Tools: http://tool.chinaz.com/
About URL encoding: http://www.ruanyifeng.com/blog/2010/02/url_encoding.html
base64, Liao Xuefeng's official website: https://www.liaoxuefeng.com/wiki/897692888725344/949441536192576