Expand your nanoblock collection and use your imagination to create a new nanoblock world of your own, with this challenging three dimensional puzzle with amazingly small sized building blocks. 800 plus miniature building blocks 4 x 4 x 5 mm. Suitable for 8 years plus. Difficulty level 1 out of 8. Size H21, W28, D4.5cm. For ages 8 years and over. WARNING(S): Not suitable for children under 3 years old. Only for domestic use.