Splinterland is a steem Blockchain oriented card game packs of cards could be purchased with crypto currency or even with PayPal. This card could then be wagered against other players online to potentially earn cash. It uses a decentralised network which gives it an upper hand against hacking. To sign up you are going to need to have a steem account and your steem account private posting key. When signing up, nothing much is involved as only your desired username and password is needed.
Splinterland doesn't interest me again as it has become a pay to win game. I can no longer find a human opponent to face . It has been racked up with bots which are mining it and are making it difficult to win matches. Thus making the amount of money paid too much