Build up lines near the edge of the board, so you have more room for navigating the game pieces around in the middle.
Try to move as few game pieces as possible.
When moving a marble away to make room for another row move it to a suitable place.
When positioning marbles for a line, get the balls farthest from the row in place first. They have a higher chance of getting blocked off.
Try to build diagonal lines. They count as if they were one ball longer. So a line with 5 balls gives you 5 points instead of 3.
Long rows are rewarded more points than short one. One 9-piece row gives you more points than five separate 5-piece rows.
If you’re planning to use a joker in a row, put it there last, so you hold on to your chance of inserting a suitable colored piece instead if one pops up. Then you’ve saved a joker.