| Min number of participants | 1 |
| Age | 8+ yrs. |
| Safety support by adult | Not required |
| Min duration | 15 min. |
| Cost | Low |
| Environment | Indoor / Outdoor |
A numeric fill-in puzzle: you're given a bank of numbers and place each one into a blank crossword-style grid based on how many digits it has and which digits must line up where lines cross.
A two-player pencil-and-paper grid game: each player secretly places a fleet of ships on a hidden grid and takes turns calling out coordinates, trying to sink the opponent's ships before their own are found.
A picture puzzle where a combination of images, letters, and symbols stands for the sounds or words of a hidden phrase — for example an eye, a heart, and the letter U together spelling "I love you".
