Crossnumbers is a logic-based math puzzle game that brings together mental calculation and the structure of cross-number puzzles. Players interpret numerical clues correctly and place the result into the one unique spot it fits within the grid. Since clues intersect both vertically and horizontally, each placement must satisfy two connected equations simultaneously. There is no guessing involved — every puzzle is completed only through reasoning, calculation, intersection validation, and maintaining correct sums.

Game objective:

To fill intersections in rows and columns to match the given clues,
To keep all equations valid without breaking the balance,
To ensure that every intersecting placement satisfies both clues at the same time.

Design principles:

Every level has exactly one unique and valid solution.
Clues guide the logic forward, they never provide the solution directly.
Each hint reveals only one number per use, aiming to strengthen the next logical step.
When the puzzle is completed correctly, all equations result in zero error margin.
Difficulty increases step by step — early levels focus on fundamental addition and subtraction, while advanced puzzles introduce multiplication, division, compound equations, and more complex clue interactions. Grid sizes scale from small beginner boards to larger, more intricate layouts. The aim is to expand analytical structuring, systematic thinking, and accurate internal validation during play.

Player gains:

Increases speed and accuracy in mental arithmetic.
Strengthens logical reasoning and structured problem-solving habits.
Improves attention control and sustained focus.
Removes the stress of incorrect placement, as equation balance internally verifies correctness.
Playable offline with no time pressure.
Encourages strategic thinking and self-testing through fair challenge loops.

Built for puzzle lovers, CrossNumbers turns solving, discovering, and accurate grid placement into a compelling gameplay flow. Completing the grid is not just a move — it’s a process of discovery, carrying the satisfaction of eliminating wrong possibilities and placing the mentally confirmed number into its only correct position. Every puzzle delivers the thrill of approaching the solution and the clarity moment when logical connections converge into a single correct intersection.