Can VPN or any Browsers bypass ip-account limit on Browser Games?

I’m playing a browser game with my brother. We got only one laptop, he wants to create his own account and play as well. Though the game rules state that we cannot create & use two accounts from one IP/same device. We already accessed the game (my account) through our phones & laptop, therefore we don’t have any other option. Could anyone show me a way, how can we both play the game securely?