Welter's Game

How to Play

The board is a sequence of numbered squares. A set of coins is placed on distinct squares at the start of the game.

On your turn, move one coin to any unoccupied square with a lower number.

The player who cannot move loses — that happens when every coin is already on the lowest-numbered square it can reach without landing on another coin.

Coins can be moved by clicking (select a coin, then click the destination) or by dragging.

About

Welter's Game is a classic combinatorial game studied in 1954 by C. P. Welter.

Source code is available at
codeberg.org/fuglede/welter.