Puzzles and logic
Logic puzzles147 problems · 13 skills
Assorted puzzles 4Balances and weights 18🔒Counterfeit coins 14🔒Egg drops 9🔒Guessing and questioning strategies 11🔒Horseshoe puzzles 4🔒Knights and liars 17🔒Logic riddles 16🔒Measuring with jugs 8🔒Money riddles 15🔒Prime clues 9🔒Sharing gold coins 12🔒Statements and converses 10🔒
Number puzzles92 problems · 9 skills
Changing digits and numbers 10Digit clues 6🔒Digit positions in sequences 18🔒Divisibility in arrays 4🔒Magic squares 8🔒Number spirals and tables 6🔒Patterns with multiples 10🔒Recovering numbers from clues 18🔒Symbol and letter puzzles 12🔒
Processes, invariants and strategy74 problems · 6 skills
Board operations and invariants 18Cycles and returns 5🔒Josephus problem 13🔒Lockers and toggles 18🔒Swaps and flips 13🔒Winning strategies 7🔒
Tournaments and games94 problems · 8 skills
Counting matches 18Games and strategy 14🔒Points and standings 18🔒Prize distribution 4🔒Ratings and scoring 6🔒Series and match outcomes 15🔒Voting and elections 11🔒Win rates 8🔒
Clocks and calendars53 problems · 4 skills
Calendars 17Clock hand angles 17🔒Digital clocks 11🔒Time calculations 8🔒