Last Updated on: 2nd January 2024, 01:08 pm

Web site: (not active)
Category: Games
Sub-Category: Puzzle
Platform: Linux
License: GNU GPL
Interface: GUI
First release: 2002

Atom-4 – a 2-player color manipulation game played with spherical pieces on a board divided into equilateral triangles. The player who first makes a row of 4 pieces of the right color wins.

Pieces may be placed only on the vertices of the triangular game board divisions, and only if touching two other pieces which themselves are adjacent
to each other (i.e., it must form an equilateral triangle with two adjacent pieces already on the board). Theoretically, the board is unlimited in size; practically, we limit it to 16 vertices across and 16 rows down.

Pieces have 8 different colors in total, grouped into 4 groups:
– black
– red, green, and blue (the primary, or “additive”, colors)
– yellow, cyan, and purple (the secondary, or “subtractive”, colors)
– white

Black and white are also called “propagators” (explained below).

The first player plays additive colors, and must make a row of 4 whites. White is the “goal piece” of the first player. Similarly, the second player plays subtractive colors, and must make a row of 4 blacks. Black is the “goal piece” of the second player.

Since neither player can play their goal pieces directly, they need to combine the colors they play in order to form their goal pieces on the game board, indirectly. Whenever an additive or subtractive piece is put on the board, it changes the color of pieces surrounding it.

Copyrighted 2002-2003 by Hwei Sheng Teoh.

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