Short Stack is free because of ads. Before its first ad, it asks your age group so the ads fit: players under 13 only get ads meant for children, and nobody under 18 gets personalized ads.
Your answer stays on your device, and in your Google Play Games cloud save if you sign in. It’s used only for ads and the Shop. If you’re under 18, Short Stack asks again a year later.
Still need help with Short Stack?
Our team answers by email. Your message reaches us with Short Stack already on it.