Unknown Square iPhone/iPod Touch

Unknown Square is a "Math Doodles" challenge that provides plenty of addition and subtraction practice, within a recreational math setting. The mathematical puzzle allows users to play with different representations of numbers, while developing their number sense to create strategies to help them solve problems.

The Challenge
Users begin to explore algebraic thinking by developing strategies to solve for unknowns found in a 3x3 array of values. Horizontal, vertical, and diagonal sums for the values are shown.

Challenge Modes
1. Solve Mode: Strategically solve 5 scaffolded puzzles in the fewest number of moves.
2. Infinity Mode: Play as long as you wish.
3. Race Mode: Rack up as many points as you can solving puzzles, before time runs out. The timer is represented by a tab of paper that works its way around the edge of the screen.

Difficulty Modes
1. Easy Mode
2. Hard Mode

Value Representation Options
(For the first three challenges)

1. Dice 2. Fingers 3. Hole Tiles 4. Ten Frames 5. Tally Marks 6. Spanish Tally Marks 7. Numerals 8. Roman Numerals 9. Chinese Numbers 10. Arabic Numbers 11. Gurmukhi Numbers 12. Hebrew Numbers 13. Hindi Numbers

14. Binary Numbers 15. Braille 16. English Words 17. Spanish Words 18. Math Prefixes 19. Polygons 20. US Coins 21. US Dollars 22. Area Fractions 23. Bar Fractions 24. Fractions 25. Random Design

Math Goals

- Number & Operations - Number Sense - Addition - Subtraction

- Money - Problem Solving - Mathematical Reasoning - Math Enjoyment