| Number | Name | Challenge Level |
|---|---|---|
| 1.1 | Count the black squares (one colour per input) | Beginner |
| 1.2 | Count the black squares (one line of input) | Growing experience |
| 2.1 | Check for odd/even numbers using modulo operation | Growing experience |
| 2.2 | Check for odd/even numbers using repeated subtraction | Growing experience |
| 3.1 | Detect parity error in a row | Growing experience |
| 4.1 | Detect parity error in 6 rows (after each row is entered) | Growing experience |
| 4.2 | Detect parity error in any number of rows (after each row is entered) | Growing experience |
| 5.1 | Detect parity error in any number of rows (after all the rows are entered) | Ready to expand |
| 6.1 | Detect parity error in rows and columns (any length) | Ready to expand |