**Tren** is a logic puzzle invented by Shinichi Aoki (Japan). The Japanese name of this puzzle means "parking" (each block is a car, and a grid is a car park). The puzzle contains a grid with numbers in some cells. The goal is to locate some blocks in the grid, having the size either **1 x 2** or **1 x 3**. Each number in the grid should be part of a block, indicating the amount of the possible movements of the block. Blocks can only move in the direction of their short edge.

**Cross+A** can solve puzzles from ** 4 x 4** to

There are variations of the Tren puzzle. Some of them can be solved by **Cross+A**.

**Tren+** (also known as *"New Tren"*):

- Each block contains exactly one number or a question sign (unknown number), indicating the amount of its possible movements.
- All cells that are not part of any block must be connected horizontally or vertically.

**Ghost Tren**:

- Blocks can also be placed without any numbers, with no restrictions on their ability to move.
- All cells that are not part of any block must be connected horizontally or vertically.