Kin-Kon-Kan
Kin-Kon-Kan is one of pencil puzzle game.
The rule is simple.
・Place mirrors in cells such that each room contains exactly one mirror.
・Letter-number pairs at the edges of the grid can be connected by straight lines that bounce of the same number of mirrors as the number in the letter-number pair.
More than 10000 stages are included in this app.
Of course, the all stages are free.