Connect the Dots
You're given nine dots in a grid. Draw four straight lines, without lifting your imaginary pencil, that touch all nine dots.
Think outside of the box. Literally.
More puzzles
Connect the Colors
Connect the colors without crossing lines.
Doorways
Travel through all the doorways exactly once.
Toothpick Equality
Add a single toothpick to form a mathematically true equality.
Toothpick Squares
Move two toothpicks to form exactly four squares instead of five.