Singles

In Singles there must be at most one number of the same value in each row and column. Your goal is to figure out (with help of logical deduction) which numbers should be marked.
The puzzles can be solved in a step-by-step manner, and you should never
have to guess.

Singles is free and contains 64 puzzles in 4 different sizes, from
5x5 to 8x8.

Singles requires Android 2.2 and we recommend a screen size of at
least 480x800.