I loved mazes and did them many times. I mainly used a Frixion pen and erased them with an iron, so there are pen marks remaining. There are a few pages where I used a regular ballpoint pen, and some parts haven't erased, but it's still usable. This is a recommended product for children who love mazes. A set of picture books where you can play with colorful illustrations and fun mazes. - Title: First Time! Maze Playbook - Title: Exciting Time Maze Playbook - Contents: Includes fun activities for solving mazes - Features: Colorful illustrations and mazes with various themes Thank you for looking.