In this cheese-chasing brainteaser, connect the matching pairs of mice and cheese using vertical and horizontal lines to create the mouse pathwaysùbut watch where you're going, because none of the trails can intersect. Lab Mice Puzzles provide plenty of addictive challenge for people of all ages. Includes 50 double-sided wipe-off cards (100 puzzles rated easy, intermediate or hard) and 2 dry erase markers. For ages 8 and up.