Levels
To win a level, the mouse must stay alive and trap all the cats using the movable blocks. Doing so changes the cats into cheese, which the mouse can eat for extra points. The player is given three lives before their game is over.
There are 50 levels, which get increasingly harder, but the player is allowed to start playing at any level. The difficulty of each level is determined by several factors. Sink holes trap the mouse for a few seconds. Mouse traps will kill the mouse if it accidentally walks into one. Flying Balls of Yarn will kill the mouse on contact. The number of Movable Blocks will determine how difficult it is to trap the cats, while the Unmovable Blocks make it hard to move blocks around and hinder navigation.
During each level a clock ticks away until it reaches a certain point, which is represented by a blue line. When this happens more cats are spawned into the level, making it more difficult, but also increasing the potential reward. After the new cats have spawned, the blue line moves further around the clock and it resumes ticking.
At higher levels, a good strategy is to capture all of the cats at one time. Building a protective box of blocks and getting inside will keep you safe until all of the cats have emerged. If the box is not too large, 10x10 blocks or so, cats will not emerge inside the box.
While it is not documented, playing experience shows that there are levels of cat aggression. If you kill a cat, the rodent is pursued more intently. When a rodent is killed, the level of cat aggression decreases for a short time. If only one rodent remains, you may even be able to be directly beside a cat with impunity for a short time.
Read more about this topic: Rodent's Revenge
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