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Puzzle 1
Starting with the 6 in the bottom left corner, what is the highest total you can make, if you only move up or right, using the mathematical signs on the way?
| + | 4 | − | 1 | + | 3 |
| 2 | + | 4 | − | 1 | + |
| − | 3 | + | 2 | − | 2 |
| 2 | − | 4 | + | 3 | − |
| + | 3 | − | 1 | + | 2 |
| 6 | + | 1 | − | 2 | + |
Note: this puzzle is not interactive, and the numbers cannot be clicked.
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Puzzle 2
Can you find every occurrence of the word APRIL that appears in this grid (horizontally, vertically, or diagonally)?
The hint will reveal the number of times it occurs, but where are they?
Note: this puzzle is not interactive, and the letters cannot be selected.
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Puzzle 3
How many squares of any size on this chessboard do not contain a rook?
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Puzzle 4
What comes next in this sequence:
2 · 3 · 5 · 7 · 11 · 31 · 71 · 91 · ?