TinkerDay

A fresh puzzles every day, across twelve subjects — maths, computer science, physics, biology, chemistry, astronomy, history, geography, economics, music, wordplay and general knowledge.

Every drop is the same for everyone, so the leaderboard is a real race: same puzzle, same day, ranked on points and how fast you solved it.

WHAT YOU GET
• A daily drop, plus bonus problems if you want more
• Twelve subjects — pick the ones you care about
• Sliding tiles, jigsaws, sudoku, cryptograms, circuit puzzles, code bug hunts and more
• Streaks, with a rescue if you miss a day
• Hints when you're stuck, paid for with points you earn by solving

GROUPS
Run a round with friends, a class or a team. Everyone gets the same puzzles at the same time, and the board ranks on points and finishing time.

PREMIUM
Create and run your own groups, and unlock bonus problems. Joining someone else's group is always free.

TinkerDay — for people who like being stuck for four minutes.