Brain teasers
Small puzzles with all the clues on the page. Work through logic, numbers, routes, and probability at your own pace.
These challenges reward a clear method rather than a quick guess. Each knowledge question has one correct answer under its stated assumptions, followed by a worked explanation. Use a pencil or calculator if it helps: there is no timer and no score penalty for thinking carefully.
The café receipt challenge
Split a bill, resize a recipe, and untangle a discount without racing the clock.
Patterns that tell you the rule
No mind reading: every sequence comes with enough information to be fair.
A pocket-sized probability puzzle
Coins, counters, and one surprisingly useful habit: count the possible outcomes.
Can you navigate this tiny town?
Turn left, follow a timetable, and find a route using only the information given.
Can you spot the missing clue?
Five small mysteries. The useful detail is not always the loudest one.