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Upgrades always come in useful, these include red balls for extra damage, blue balls to increase your shield so you can avoid as much damage as possible and green balls for health.
Try to create as many combos as possible because the more matches you can make the more moves you will get.
Whenever you have no match to make look to sabotage your opponent by breaking sets of two balls.
Remember when making decisions that different colours have different effects on the board.
Make sure you keep your eye on the opponents shield so you can opt for a weak attack whenever you see the opponent has it maxed out.
A strategy that works well is to first focus on building up your side and then use the extra balls to sabotage your enemy.