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TREN is a logical puzzle invented by Shinichi Aoki (Japan). The Japanese name of this puzzle means "parking". Every digit is a part of a car and the grid is a parking space.
The goal is to extend the cell with a digit to cars of size 1x2-cells or 1x3-cells. The digit indicates the number of possible movements of the car.
Cars can drive forwards and backwards.
Follow the instructions below to solve the TREN puzzles from this website.
All the cells of the grid must be part a part of a car or white (= driving zone).