Calculuz is an engaging and challenging math puzzle game that requires players to use their arithmetic skills to fill in missing numbers in a given formula.

The game is organized into different formula collections, with each collection containing a series of formulas that increase in difficulty.

Players progress through the collections by filling in the missing numbers in each formula correctly.

The game mechanics are simple but effective, with players using the available numbers on the board to complete the formula.

To increase the challenge, the game gradually increases the size of the board and the range of numbers available as players progress through the collections.

Some formulas also have a time limit, which adds an extra layer of difficulty and encourages players to think quickly and strategically.

Calculuz also features power-ups and highscore lists, which add an extra element of excitement and competition to the game.

Players can use power-ups to reveal the numbers they can use to complete a formula successfully, while highscore lists allow them to compete against others and strive for the top spot.

Overall, Calculuz is a fun and challenging math puzzle game that is sure to test players' arithmetic skills and keep them engaged for hours on end.