Natsume today announced that Hi! Hamtaro Ham-Ham Challenge has shipped to retail, exclusively for Nintendo DS, and is available for an MSRP of $29.99. In Hi! Hamtaro Ham-Ham Challenge, children will will develop their memory, word comprehension, math skills, and many other abilities as they play through 12 engaging, interactive games. Parents can monitor their child's growing abilities, adjust the difficulty level to match their child's skills, and reward them with special items.