The word list prints with the puzzle; the answer key prints on its own page.
From the ancient wheel to the lightbulb and the telephone, seven inventions that changed the world are hidden in this easy grid. Each one reads forward only — left to right or straight down — which is more predictable than most eureka moments ever were.
| T | E | L | E | S | C | O | P | E | E |
| P | N | T | E | N | A | N | R | T | C |
| C | G | N | W | H | E | E | L | E | E |
| A | I | O | C | R | A | D | I | O | S |
| M | N | N | L | A | R | L | T | A | W |
| E | E | T | A | H | C | C | E | T | I |
| R | L | I | G | H | T | B | U | L | B |
| A | L | R | I | M | E | F | P | N | B |
| T | E | L | E | P | H | O | N | E | N |
| U | H | G | A | N | A | W | D | H | I |
| T | E | L | E | S | C | O | P | E | E |
| P | N | T | E | N | A | N | R | T | C |
| C | G | N | W | H | E | E | L | E | E |
| A | I | O | C | R | A | D | I | O | S |
| M | N | N | L | A | R | L | T | A | W |
| E | E | T | A | H | C | C | E | T | I |
| R | L | I | G | H | T | B | U | L | B |
| A | L | R | I | M | E | F | P | N | B |
| T | E | L | E | P | H | O | N | E | N |
| U | H | G | A | N | A | W | D | H | I |