I designed the game, built it, and released version 1.0 on the App Store in August 2026. You type what you want, a mushroom lamp or a pig-shaped sofa, and the piece appears in your room in the same hand-drawn style. Visitors come with a room they wish for and a budget, and you decorate it for them. Hiu writes to you from her travels, and you can write back with a photo of the room.

The hardest problems were about how Hiu behaves. In testing, she sometimes made up excuses, for example saying she had overslept and missed a message she never actually received. Adding rules against it did not help much. What worked was giving her plain facts about her situation, such as when each message was really sent. Debugging her this way reminded me of what I had read in cognitive science about how people fill gaps in memory, and it is the question I most want to keep studying.

Hiu has more than 150 player accounts, more than 170 pieces of furniture, and in-app purchases. Before launch I interviewed more than 20 players and ran a TestFlight beta. A US$110 TikTok test brought in 110 waitlist sign-ups.