GEOBRIX 3-Way Building Puzzle _ Teacher Pack _ Bundle of 6 Identical Puzzles 13 colorful multi-shaped pieces. Dozens of spatial challenges. 1st Objective: Fit the pieces back into clear acrylic tray. Find all 18 different solutions. 2nd Objective: Create 20 different silhouette images using some or all of the pieces. 3rd Objective: Use all 13 blocks to create a cube. 5" x 5" clear acrylic puzzle tray with snap on/off lid.