Here is a message from the OP blockladder, which have been deleted since but still appears in a quote:

https://bitcointalk.org/index.php?topic=1306844.msg13387075#msg13387075

Does not mean the puzzle is not legit but blockladder doesn't seem to have a lot of faith in Bitcoin, maybe why he is giving it away lol.

Also googling for "blockladder bitcointalk" I found a page with title "Block Ladder: shroom supply" and it does really weirds stuffs (popups and alerts everywhere) when you click the first button (do at your own risk, or just don't).