Gamespot has posted a new demo of proven game at E3: this time it's Quantum Conundrum , the eclectic first-person puzzle game by Kim Swift, the creator of Portal. And from what we can see in the video, the new game for Live Arcade resembles its predecessor: the tech theme and Sci-Fi is replaced by a more "homemade", but the puzzles are based on the activation of size able to make heavier objects, light, lenses and so forth show the same level of creativity and ingenuity of Valve. Seeing is believing.