Kakuro is a Japanese logic puzzle that's similar to a Western crossword, but with a mathematical bent. In it you need to create sums that add up correctly through a number of columns and rows to ultimately complete the puzzle, ensuring that it makes mathematical sense. Kakuro2 offers VR support and nine difficulty levels, but learning the concepts of the game can still take a bit for new players (though it is well worth it). Skilled players can compete on the leaderboard.