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game

Yih or Luk Tsut K'i or Three Men's Morris

11 to 18

Some puzzles requiring no knowledge of knot theory, just a careful inspection of the patterns. A glimpse of the classification of knots and a little about prime knots, crossing numbers and knot arithmetic.

Colourful books on curved library shelves.

game

Online

7 to 11

Can you end up with all the occurrences of the same letter in this two-player game?

problem

Nim

14 to 16

Start with any number of counters in any number of piles. 2 players take it in turns to remove any number of counters from a single pile. The loser is the player who takes the last counter.

game

Down to Nothing

7 to 11

A game for 2 or more people. Starting with 100, subratct a number from 1 to 9 from the total. You score for making an odd number, a number ending in 0 or a multiple of 6.

problem

Counters

7 to 11

Hover your mouse over the counters to see which ones will be removed. Click to remove them. The winner is the last one to remove a counter. How you can make sure you win?