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Lee Haywood's Chain ReactionFREE!
In Chain Reaction (aka Critical Mass, aka Atoms), players take turns to add units of their colour to either an empty cell or a cell they already occupy.
Once the number of blobs in a cell equals the number of neighbouring cells - 2 in a corner, 3 along an edge and 4 elsewhere - the blobs 'explode', adding 1 blob to each neighbour and leaving the original cell empty.
Wipe out your opponents and win - eventually someone is going to win because the total number of blobs increases by 1 with each move, gradually filling the board.