If you like Sudoku, you would like Suriza, too.
In Suriza (Slitherlink) you have to draw a closed line between the points. It is not allowed to cross over the lines. A number in the box indicates how many sides of the box are part of the way.
For explanation you can look at the tutorial in the app.
There are 5 different levels of difficulty.
With more difficult levels you can get more points. For a maximum of points you have to solve the level so fast as possible and use so less clicks as possible.
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The score is calculated as follows.
Difficulty * 100 * field width
i.e. a 14x14 playing ground "Very hard":
5 * 100 * 14
Per click and per second, a point is deducted.