Worms Blast takes place on water which is lucky really as your character only has a boat to get around in. Above you, coloured blocks move closer to you every so often. Fortunately you can shoot the blocks to destroy them, however your weapon is colour coded and you must hit blocks of the same colour as your weapon to destroy them. Hitting a block of different colour from that of your weapon will recolour it (and the surrounding blocks) to the weapon's colour. If you destroy a block, blocks of the same colour touching the destroyed block will also be destroyed.