Sunoku

Place one sun in every row, every column and every colour. No two suns may touch, not even at a corner. That's the whole rule.

Sunoku starts gentle and grows into one of the most satisfying logic puzzles you can carry in your pocket. Every board has exactly one answer, and every one can be solved by reasoning alone. You never have to guess.

OVER 1,000 PUZZLES • Classic: Sunrise and Corona, ordered from easiest to hardest • Mini: quick 5×5, 6×6 and 7×7 boards for a coffee break • Extreme: the toughest boards at three sizes • Special: Patterns, Pictures and Blocks, boards set by hand in rainbow colours

HINTS AND COACHING ALONG THE WAY Stuck? A hint shows you the next move and explains why it works, so you get better with every board. As you progress, you'll unlock the Coach, which shows you the fastest way through a board and reviews your own solves move by move, and then the Level Builder.

LEVEL BUILDER Make your own puzzles. Choose a size and a difficulty, then pick up to two techniques you want to practise, and the Level Builder makes a fresh board that needs them. It's the quickest way to master the move that keeps catching you out.

A NEW DAILY, EVERY DAY Easy, Medium and Hard, the same three boards for everyone. Post your time and see how you stack up on the leaderboard.

FIRST TO FIFTY, EVERY FRIDAY Seven boards back to back, fifty suns, one run. Race everyone to the finish.

BADGES AND REWARDS Earn badges as you play, and unlock new suns, crosses, skies and palettes to wear.

MADE TO BE CALM • No ads, ever • Play the puzzle sets offline. The daily and First to Fifty need a connection. • Undo, redo and restart, with no penalties for thinking • A colour-blind palette • Optional ambient music, generated as you play • Gentle haptics as you place suns and crosses