How to play. Paint wet ink on the pages, then fold. Everything wet prints mirrored onto the facing page. On iPhone Duo, close the phone to fold; on any other device, use the Fold button or swipe across the spine.
Restore a purchase. Open the paywall and choose Restore Purchases, signed in with the same Apple Account.
Colour blindness. Settings → Always show ink patterns adds a pattern to every colour.
Email hello@hammantlabs.com.