ROOFTOP RIVALS · TEN SMALL STUDIES
Make room
for the last sunbeam.
Blue canopies run north–south.
Clay awnings cross east–west.
Leave your rival without a place to go.
One roof. Two directions.
A very satisfying little squeeze.
saved on this device
First light
FIELD NOTES
A shared roof, a different direction.
These are the classic rules of Domineering: one side places vertical dominoes, the other horizontal, and the first side with no legal placement loses. Sunlace has an independently written exact local opponent, ten original roof layouts, hints, whole-turn undo and optional local progress. There is no score to optimize: leave your rival with no move.
A small sun at a square marks a legal starting point. Tap there to place immediately. A hint outlines two squares; tap the top one. Skylights are closed from the start. If you lose, undo the last exchange or try another roof.
The rooftop theme is inspired by the IEA’s Renewables 2026 report, published November 6, and the current COP31 energy-transition discussion. This is an abstract board game, not a solar design or energy planning simulator.
Keyboard: focus the board, use arrows to aim and Enter/Space to place. H shows a hint, U undoes an exchange. All ten roofs are available from the roof menu. Seals are stored only in your browser when storage is available.
GitHub rules reference: MedAly666/domineering · MIT · 1 observed star · last push September 18, 2025. Inspected as a rules reference; no code, layouts or assets copied. It did not meet the popularity/recency preference, so this is the original fallback.
Readable local source: rules and solver · interface · original roofs · MIT license · provenance.
Topic sources: IEA Renewables 2026 and UNFCCC COP31. The source links are optional and open in this tab. The game uses no remote resources. Solar and awning artwork generated with a GPT image model and optimized locally.