You are trapped in a room with the Book of Shadows. Solve its five shadow puzzles before midnight, or the shadow comes to trap your soul in the book. Solve them all and you are free.

🕯️ Play it in your browser (best in landscape, with headphones or sound on): Book of Shadow You can also check out the File from the Rive Marketplace: Marketplace Community File

How it plays Strike the match, open the cover, and carry one candle across five pop-up paper figures: the Witness, the Oath, the Confession, the Sacrifice and the Coronation. Each figure's shadow moves with real light, and near the right angle it turns into the monster it hides. Hold the light there to break the vow. Every page is written in a cipher drawn for the book, and its key is hidden in the pages. Hold the flame at the edge of your sight to look around the room, but don't touch the door. At midnight it opens.

How it was made Built with the Rive CLI and GPU Canvas. AI coding agents wrote the RML (the scene, the pages, the state machine and the data binding), the Luau scripts (the game, the paper folds and the ending) and the WGSL shaders (shadows that morph into their monsters, a ray-marched fog, candle flames and light through the paper), all from my direction and playtests. After every change, automated checks replay the game with synthetic input, and I check the 3D work in the game's own debug console that I created for me and the agent as verification. Every illustration is a classic 2D Rive vector drawing and animation. When something is off, I fixed it by hand in the Rive Editor.

@Rive features: Rive CLI · GPU Canvas · Luau scripting · Data binding and state machines