Final Scratch Game

My scratch game is going to be a series of mazes with increasing difficulty each level. I am using a polar bear sprite, who's goal is to reach the crab sprite. My background will be the mazes themselves, which will change every level. I want to use the time variable to set a time for how long the player can try and complete the maze. If the player runs out of time then they have to start over. I will increase the difficulty of my levels my making the maze itself harder to complete in the allotted time.