Two to 36 players match color photographs of rocks, minerals and gemstones with relating trivia facts or physical/chemical properties. With two levels of play, students will unearth three rock types and dust off some interesting trivia. The game involves practice with 70 different rocks, minerals and gemstones and includes color game boards, calling cards, plastic markers and an instructional guide. It teaches the physical characteristics of rocks and minerals, the rock cycle, and the characteristics, uses and names of rocks, minerals and gemstones. "All our games offer multiple levels of play and are aligned with national standards. They are made with the needs of every learner in mind," Alyssa Brown, product development manager for World Class Learning Materials, told TDmonthly. Launch date: 2009.