Object: Visit the three far corners and return to the start square at the lower left.
 
The rat starts at the lower left square. It has to eat the three pieces of cheese in the far corners and then return home to its starting position.
 
After every move of the rat, an additional piece of wall drops into the labyrinth. However, with each piece of cheese eaten the rat gets stronger and can gnaw through the diagonal walls (two diagonal walls per cheese). The strength of the rat is indicated at the left border by a number of cheese bites.
 
If you lose your last strength (no yellow cheese bites left) you die. Hence you have to arrive back home with at least one strength left!
 
Some variants drop additional cheeses. It is optional to go and eat them. Eating them strengthen the rat. Also, some variants of Labrat have a higher rate of walls dropping and/or more bites per cheese.
 
Variant by variant the challenge gets harder...
 
 
More freeware as well as real puzzles and games at http://karl.kiwi.gen.nz.