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Atoms 3D (Free)

Here's a sample 2D board to show you how the game works. This is a 2 player game (on the phone you can play 1 player against the phone or 2 to 4 players can share a game).

Take it in turns to click on a cell and add a particle. When the number of particles in a cell reaches critical mass (4 in this case) a chain reaction will begin.

The player who can turn all the cells on the board their colour wins. Near the end of the game picking the right cell can change the whole board back to your colour.

Give it a try!