Imaginarium Alphabet & Numbers Foam Puzzle Mat - 36-Piece This Imaginarium Alphabet & Numbers Mat - 36-Piece, a Toys 'R' Us exclusive, puts learning right at your youngsters' feet. The set includes 26 letters and the numbers 0 through 9. It covers 36 square feet including the borders, and is slightly over half an inch thick. The pieces come packaged in a zippered plastic sleeve with a handle for easy transport and storage. Designed for indoor and outdoor use, it's a great way to provide a safe play area that stimulates learning.