Mathrid is a number crossword puzzle game in which players fill a grid so that every row and column forms a correct math equation. The app presents a crossword style structure made of numbers rather than letters, requiring logical reasoning to interlock equations both across and down. Each puzzle is designed so that one correct move unlocks the next, and the grid provides immediate visual feedback: a line turns green when it is correct and red when it is incorrect. This approach emphasizes deduction over guessing. The app includes 500 hand crafted puzzles across five difficulty levels. Players begin with addition and subtraction, then progress to multiplication, division, and multi step equations. A daily challenge offers one new puzzle each day, and a smart hint system provides a gentle nudge toward the next move without revealing the full solution. The app also supports a streak tracking feature for daily play. Typical use involves selecting a puzzle, filling in numbers to satisfy each row and column as a valid equation, and using the instant feedback