Pentomino chess game puzzle/brain teaser

Challenge yourself or a child or friend with a wood puzzle box of 12 assorted groupings of cubes. There’s one way to build the checkerboard with alternating colors but other ways to construct bigger cubes or letters of the alphabet or animals or geometric shapes. There are online videos you can look up. The puzzle box and pieces are 1/4 inch balsa wood. The game is in good condition but one side of the cover lid could be reglued if wanted. See photos. 5.6 x 5.6