Seems legit and best ICO token sale in the market I think. For each token it cost around 0.0001 btc you can how much you want and there is mentioned date for the token sale in the op itself.
I hope credit token is called you can get the token as a credit from the team. Check with the John he is doing support works here.

Yeah, guys, John is here! We will let you know credit token mechanics soon, we have to agree on wording before

Greetings!
Tokens​ ​start ​​trading ​​on ​​crypto ​​exchanges  one to two months after the end of the tokensale, which ends in mid-January 2018 (or sooner, if the token issue cap is reached).
First day of ICO is a presale. You can receive up to 33% token bonuses

Thanks

Are you tokens ERC-20 compatible?
And can i buy them with USD?

Members of crypterium on telegram https://t.me/crypterium Increasingly every day, please join there to get the latest updates about crypterium, you can also ask about this project and get the answers easily, fast because admins are very Active there
And many community on there can help you, so Do not wait anymore let's join and get the benefits from there.

Thanks Mike! One more question, how does Crypterium differ from lets say Polybius?
Thanks in advance one more time

Clear. Look forward to seeing your wp

Wow this seems a nice project, I will participate on the bounty campaign. 👍 Good Luck ☺️