Level 331 is not that hard but you may need a great deal of luck to beat it. In order to get to the silver tiles, you first need to clear the way to the portals, which are blocked by shells. Once you’ve opened the shells and collected the pearls, the tires will fall, and you will be able to clear the silver and golden tiles.
If you are unlucky and there are no possible matches in the left or rights parts of the game field, go for matches under the portals in the middle. Which way you may possibly create some good matches in the sides of the field. Also, don’t forget about the crates, as there are golden tiles behind all of them.
As a general tip, keep a close eye on the field, as it is essential that you do not miss a chance to create more power-ups! Do not rush into using them though – try to get a couple of power-ups close to each other and activate them in a single move. This will clear more space and will charge the Lightning power-up faster.