Prism: Light the Way hands-on at Gamespot.

"Glowbos must surely be among the dumbest and most fortunate creatures in existence. They need light to survive, yet they choose to reside in underground caves where there is none. In fact, if it weren't for a friendly, light-emitting alien race known as bulboids--not to mention the numerous mirrors, colored crystals, and T-junctions that can split beams of light in two that are found in the caves--the glowbos would surely have long since been extinct. This is the unusual premise for Eidos' upcoming puzzle game Prism: Light the Way, and we recently had an opportunity to spend some time with it."

Full Source: Gamespot