Tenfold.

Empty the grid by pairing up numbers in this minimal take on the classic paper-and-pen game. Whether you're in it to win or just need to let your mind wander, Tenfold is the perfect pastime. Tenfold features: - Thoughtful and focused sudoku-like gameplay - Endless challenges from a single starting point of the same 27 numbers - No game over – keep going for as many rounds as you need to pair up everything - A simple, no-frills design - A dose of nostalgia for those who remember the game from their school years