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PEBBLE DUEL

TAKE-AWAY PUZZLE · AGES 6–10

Pebble Duel

Take one or two pebbles from River or Hill. Whoever takes the last pebble wins.

You go first. These starting piles give you a winning route. Pebble always takes a winning route when it has one. You can undo.

River ≋● ● ● Hill ⌁● ●

Pebble Duel help

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Game guide

About Pebble Duel

Choose a pebble move, then consider Pebble's deterministic reply.

Suggested age
Ages 6–10
Practice
Choosing a move and considering the opponent's reply
Pace
Untimed; one bounded round, with an optional changed-piles rematch.
Controls
Keyboard, Touch
Reading
Short move labels; detailed opponent reasons need reading or adult support.
Instruction help
Replayable labelled two-turn examples in Rules help. Spoken instructions are not included.

How to play

Choose one or two pebbles from River or Hill, then confirm the move. Whoever takes the last pebble wins. Every supplied opening favours the first player with perfect play, and the child always goes first.

Adult help

A grown-up may need to read the rule and explain winning route. Every supplied opening favours the first player with perfect play, the child always gets that advantage, and this is not an evenly matched competition.

Accessibility

No spoken instruction; emerging readers may need adult help with strategy explanations.

Detailed access information
Keyboard
Every game action is a labelled native button.
Touch
Every game action uses a large touch control.
Screen reader
Board counts, turn, choices and feedback are text. Manual review remains pending.
Timing
Untimed; Pebble moves only after an explicit action.
Motion
No motion is required.
Sound
No sound is required.