In excellent Condition. One marble missing. Trusted by Families Worldwide - With over 50 million sold, ThinkFun is the world's leading manufacturer of brain games and mind challenging puzzles Develops critical skills – Playing your way through the challenges builds spatial reasoning and planning skills, and is partly an engineering and building toy that provides a great stealth learning experience for young players What you get – Gravity Maze is a combination logic game, marble run, and STEM toy that's one of the best gifts you can buy for boys and girls age 8 and up It contains 60 challenges from beginner to expert, a game grid, 9 towers, 1 target piece, and 2 marbles Clear instructions – Easy to learn with a clear, high quality instruction manual You can start playing and solving right away Comes with multi-level challenges - Gravity Maze comes with 60 beginner to expert challenges that become increasingly difficult as you play through them