Level 159

Difficulty

 * It can be very difficult as the chocolate may block the top part of the board and prevent any of the candies from appearing. If that happens, it is difficult to clear the chocolate, except by using vertically striped candies, otherwise you will eventually run out of possible switches, failing the level.
 * However, 2 minutes is more than enough time limit to get 20,000 points.
 * The player is required to earn at least 180 points per second.

Strategy

 * Prevent the chocolate from blocking the top, as it significantly decreases the chance of making special candies. Make a lot of special candies and be fast.
 * If you reach the target score but the chocolate blocks the entrance, do not make anymore moves and let the time end. It can prevent you losing from no possible switches.