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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.

game

Pentanim

7 to 16

A game for 2 players with similarities to NIM. Place one counter on each spot on the games board. Players take it is turns to remove 1 or 2 adjacent counters. The winner picks up the last counter.

$Got \It for Two$

game

Got It for Two

7 to 14

Got It game for an adult and child. How can you play so that you know you will always win?

game

Femto

14 to 16

A new card game for two players.

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?

game

Celebrate 25 Years of NRICH

5 to 14

To celebrate NRICH's 25th birthday, why not play this special version of our classic game, Got It? Can you devise a strategy so that you will always win?

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.