Place a star in every row, every column and every coloured region, and never let two stars touch. Every puzzle has one solution you can reach by reasoning alone, never by guessing.
The same daily puzzle for everyone, with a streak to keep. It works offline, so a train tunnel is no excuse.
From quick 5×5 grids to fiendish 11×11 ones, then two stars a line in Star Battle. No lives, no energy, no waiting.
A high contrast theme, a pattern in every region for colour blind players, and region colours tested to stay apart.
A hint first shows you where to look. Ask again and it explains the reasoning in plain words, with the cells it is about lit up, and only then fills it in. You learn the moves instead of being handed the answer.
