Guess Who Maker has grown a lot over the past month and it's still run by one person. Playing will always be free; if you'd like to help with the servers, any contribution helps.
You can make a one-off contribution through Ko-fi, Buy Me a Coffee or PayPal. There are no tiers and nothing is locked behind a payment — the whole game stays free.
Donate with the same email as your account and a Supporter badge is added to your profile automatically. If you used a different email, you can link it from this page once you're signed in.