Suriza is traditional puzzle game.
This apps has more than 10000 stages!
Of course, the all stages are free.

Suriza is played on a rectangular lattice of dots. Some of the squares formed by the dots have numbers inside them.
The objective is to connect horizontally and vertically adjacent dots so that the lines form a simple loop with no loose ends.
In addition, the number inside a square represents how many of its four sides are segments in the loop.