Level 92 starts by matching red and white pieces. Then you should match two Lightning power-ups that you get from the crates. The blast will unblock the rest of the field.
Match pieces near the bottom of the playing field (or as low as possible) as often as you can. Doing this will shift the largest amount of pieces and start a chain reaction that will create new opportunities to make power-ups.
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.