This is Atomz by Silicon Based Life in 1994

The object of this Game is to turn all your Enemy peices into your colour, which will then make you the winner

Placing your Blobs in each block, they will grow out from 1 to 4, at which point they will explode all over the place, and effect any cells nearby, which will also explode and change into the current players colour

Once you have obliterated your opponent, it is Game Over for them, and you win, sadly the game is pretty basic, and has no win counter, or even any sort of scoreboard

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Publisher: Silicon Based Life
Code: Kev Crate