The goal of level 49 is to collect the gold nuggets and clear out the golden and silver tiles. There’s a couple of ways to clear the goal tiles:
1. Use a Lightning to unchain the piece in the center. However, you’ll first need to clear out the earth tiles for the pieces to fall into the empty tiles.
2. Try to activate several power-ups so that the explosion can clear out the tiles at the bottom. You can get to the gold nuggets by making matches next to earth tiles and by using power-ups.
Remember that combo-explosions will charge the Lightning power-up faster!