Level 346 is timed, so we recommend making as many matches as possible. You should concentrate on making matches at the bottom of the field as there is more space for collecting power-ups, which come in handy on this level. As soon as you start unearthing the gold nuggets at the bottom of the field, the earth tiles at the top will start moving down and will make it easier for you to clear 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.