Abstract: A cubic puzzle includes eight identical elementary pieces. Each elementary piece is composed of eight identical blocks. The lower layer has a first, a second, and a third block linearly connected to a side face of each other and a fourth block transversely and securely connected to a side of the third block. The upper layer has a fifth block securely connected to a side of a sixth block, wherein the fifth block is formed on top of the first block, and a seventh block securely connected to a side of an eighth block, wherein the seventh block is formed on top of the fourth block. A position relationship between the sixth block and the fifth block and the seventh block to the eighth block corresponds to a position relationship between the fourth block and the third block.

Abstract: A cubic puzzle includes eight identical elementary pieces. Each elementary piece is composed of eight identical blocks. The lower layer has a first, a second, and a third block linearly connected to a side face of each other and a fourth block transversely and securely connected to a side of the third block. The upper layer has a fifth block securely connected to a side of a sixth block, wherein the fifth block is formed on top of the first block, and a seventh block securely connected to a side of an eighth block, wherein the seventh block is formed on top of the fourth block. A position relationship between the sixth block and the fifth block and the seventh block to the eighth block corresponds to a position relationship between the fourth block and the third block.

Abstract: A polyomino piece includes a cube with six sides. Five sides of the cube each have four openings defined therein and arranged in two rows and two arrays. The remainder sixth side of the cube has two openings catercorner defined along a diagonal of the sixth side, and two first lugs catercorner formed along the other diagonal of the sixth side. A plurality of polyomino pieces can be combined to form various patterns, and the first lugs are hidden inside the patterns and cannot be seen at the outer surfaces, so that the patterns have nice appearances and can be stably placed.