I'm not sure how it's gonna count to 120 but you could get 100 spins through their in-game 'Hpoint' token which you can use it in all of their games. Also, it can be used in the Jackpot game to convert it into 'Hash' tokens which are another game token with you can stake and start receiving the dividend from the house profit. Below link will give you the details about the same
https://bethash.zendesk.com/hc/en-us/articles/360031750792-SIGNUP-BONUS
Thank you very much for helping out! Actually we can just complement that the other 20 FREE SPINS are being credited automatically just by binding the email address to your BetHash account!