Cryptoku is a unique, fast-paced number puzzle that will challenge your logic skills!

Catch the numbers as they fall from the top of the screen. Place them in the grid to solve each level. Like Sudoku, each number can only appear in the grid once... but unlike Sudoku, the numbers (and the grid itself) will try to foil you.

• Numbers that escape (or are wrong) count against you.

• Some falling numbers count backwards... or skip digits.

• /tmp numbers fade away.

• Rotating keys change out their solution with another number in the grid.

• Viruses infect neighboring numbers.

Press the pause button (lower left corner) on the game screen to toggle music, sound, and color-blind mode.

Play a Crypto game, which is longer and suitable for all skill levels. Or try your luck in a Hack game: sudden-death mode that starts tougher and can end much quicker!

Both game types have Game Center leaderboards.