guaishou brain teasers with the puzzles 21pcs unlock interlock game iq test toy 3d wooden and metal for party favor kids adults challenge guaishou test logic and creative minds with this cool yet simple brain teaser. <br>these brain games are perfect for passing time, fidgeting, and avoiding gadgets and electronics. <br>they’re a healthier way to practice focus and concentration.<br> can also be used for fun party games.<br> 3d brain teaser : precision assemble non-identical pieces into a 3d shape. challenging 3d puzzle game. <br>your mind will be sharpened enough to develop their problem solving capacity through reasoning, development of mental stamina and boosting their self-confidence.<br> perfect gift - for every occasion!<br> for christmas gifts, office gifts, etc. <br>3d brain teaser can take anywhere.