Spintronics Power Pack Fat Brain Toys Interlocking cubes come in 10

Interlocking cubes come in 10 bright colors for sorting and grouping

vegetable-based inks for eco-friendly play

and surprises

These percentage tiles make abstract maths concepts click

and social interaction in groups

Spintronics Power Pack Fat Brain Toys Interlocking cubes come in 10Spintronics Power Pack Designed to enhance your Spintronics system with more power and advanced puzzle challenges Includes a second 6 V spintronic battery to expand circuit complexity Comes with two low value resistors: 100 and 50 , for more precise resistance control Contains a Power Pack puzzle book with 11 brand new, progressively challenging puzzles Requires Act One to function; to complete all puzzles, both Act One and Act Two are needed Offers