This is not a free to play game; you will need to buy some buildings to play the game and earn your rewards.
And also it needs Steem Keychain addon to sign into the game. I think, they should also support signing up with steem connect.
You are viewing a single comment's thread from:
I don't know about technicalities but, I think, in layman terms, Steem Keychain is chosen as the first option for the login because of Steem Engine based NFTs and SIM tokens.