There are 50 levels in the game. Each level consists of a set of 10 mazes. So, there are 500 mazes in total. There is level select menu where you can choose any completed level. But you cannot choose the specific maze in the level – they go one by one and if you fail at any of the 10 mazes you choose start the level from the beginning.
You have 60 seconds but the time can be increased or decreased using pickups. Also, sometimes you should wait to avoid dangers, use alternative paths or teleport to be able to move forward.
The difficulty of the levels is increasing with each level and is determined by the size of the maze, the amount of time bonuses and other items such as moving walls, teleports, closed doors and other.
Sometimes time bonuses that give additional time are not bonuses at all because it can take more time to get to them that they bring. And negative bonuses can save time because of opening another sort path to the exit. So, you should decide which bonus you should take and if they worth it.