How to play

Goal: Find what links the clues.

1. 1You start with one clue. Every wrong guess reveals another.
2. 2Type your answer and press Guess. Case, accents and extra spaces don't matter.
3. 3Guess right before you run out of tries.

Goal: Guess the hidden word.

1. 1Type a word of the right length and press Enter. It has to be a real word.
2. 2After each guess, the letters change colour:
3. 3Cin the word and in the right spotRin the word, but somewhere elseAnot in the word
4. 4Find the word before you run out of guesses.

Goal: Sort sixteen words into four groups of four.

1. 1Select four words that share something, then press Submit.
2. 2Groups range from easy (yellow) to tricky (purple). Watch out for words that seem to fit more than one group.
3. 3“One away…” means three of your four words belong together.
4. 4Find all four groups before you run out of mistakes.

Goal: Fill the grid with digits.

1. 1Every row, column and box must contain each digit exactly once.
2. 2Select a cell, then tap a digit or type it. Turn on notes to jot down candidates.
3. 3Clashing digits are highlighted. A full, correct grid solves the puzzle.

Goal: Shade the right cells to reveal a hidden picture.

1. 1The numbers beside each row and above each column give the runs of shaded cells in that line, in order, with at least one blank cell between runs. 0 means the line stays blank.
2. 2Tap a cell to shade it, or drag to shade a line. Switch to Mark X (or right-click, or press and hold) to mark cells you know stay blank.
3. 3A clue fades once its line matches it. Match every clue to reveal the picture.

Goal: Place the stars.

1. 1Put exactly one star in every row, every column and every coloured region.
2. 2Stars may never touch, not even diagonally.
3. 3Tap a cell once to mark it as empty, twice for a star, and again to clear it.

Goal: Draw one line through every cell.

1. 1Start on 1 and drag to neighbouring cells. The line can't cross walls or itself.
2. 2Pass the numbers in order and end on the highest one.
3. 3Go back over the line or tap a cell on it to undo. Fill every cell to finish.

Goal: Fill every cell with a sun or a moon.

1. 1Each row and each column holds as many suns as moons.
2. 2No more than two of the same symbol may sit side by side in a row or column.
3. 3An = sign means the two cells match; a × means they differ.
4. 4Tap a cell for a sun, again for a moon.

Goal: Reach the target number.

1. 1Tap a number, then + − × or ÷, then another number: the two become their result.
2. 2Each number can be used once, and every result must be a positive whole number.
3. 3Make the target exactly to win. Check saves your closest attempt; Give up shows a solution.

Goal: Find the forced checkmate.

1. 1Your opponent has just moved; their move is highlighted. You play the side at the bottom of the board, and the line above it says how many moves the mate takes.
2. 2Tap a piece and then a square, or drag the piece there. Every correct move is answered by your opponent; a wrong one is taken back and costs a mistake.
3. 3Deliver checkmate before your third mistake. Any mate on the last move counts. The puzzles come from the Lichess puzzle database.

Goal: Lay every domino so each coloured region's rule holds.

1. 1Pick a domino from the tray, then tap two neighbouring cells to lay it. Its left half goes on the first cell; Flip (or R) swaps the halves. Tap a laid domino to take it back.
2. 2Each coloured region has a rule on its badge: a number means its pips add up to that, = all the same, ≠ all different, < and > a total below or above the number. Cells outside the regions take anything.
3. 3Lay them all and press Check: any layout that meets every rule counts. The clock starts with your first tap, and every wrong check costs 5 points.

Goal: Name the country from its outline.

1. 1Start typing a country and pick it from the list.
2. 2Each wrong guess shows how far away the answer is, the direction to head in, and how close you are in percent.
3. 3Find the country before you run out of guesses.

Goal: Name the country from its flag.

1. 1The flag is covered by six tiles; one of them starts uncovered.
2. 2Start typing a country and pick it from the list.
3. 3Each wrong guess uncovers another tile and shows how far away the answer is, the direction to head in, and how close you are in percent.
4. 4Find the country before you run out of guesses.

Goal: Travel from one country to another over land.

1. 1Name countries one at a time to build a chain of neighbours between the two.
2. 2Green countries are on a shortest route, yellow ones are a short detour, red ones are far off.
3. 3The route is complete as soon as your countries connect start and end. Use as few guesses as you can.

Goal: Pin five cities on the world map.

1. 1You see a city and its country. Tap the map to drop your pin; drag to move around and use + and − to zoom.
2. 2Move the pin until you're happy, then press Confirm. The map shows where the city really is.
3. 3Each city scores up to 100 points: full points within 50 km, fewer the farther away. 500 is a perfect game.

Goal: Pick the bigger one, ten times.

1. 1Each round shows two countries or cities. Tap the one with more people, or the larger area when the question asks for it.
2. 2Both numbers are shown right after your pick. Then go on to the next pair.
3. 3Get at least 6 of the 10 right to solve it: every right answer is worth 10 points. The numbers come from GeoNames.

Goal: Work out where and when five historical photos were taken.

1. 1Tap the map to drop your pin; drag to move around, and tap again to fine-tune.
2. 2Pick the year with the slider, then press Guess.
3. 3Each photo scores up to 100 points for the place and 100 for the year. The closer, the more.

Goal: Work out where five film scenes were filmed, and when.

1. 1Tap the map to drop your pin where the scene was filmed, then pick the film's release year.
2. 2Know the film? Name it for 50 bonus points. Leave it empty if not.
3. 3Each still scores up to 100 points for the place and 100 for the year.