The namesake of this round is Puzzle Fusion by Tawan Sunathvanichkul (Thailand), held on November 2011.
Duration: 30 minutes. Total point value: 350 points. Round winner: Ken Endo (Japan) and Philipp Weiß (Germany), 235 points.
Round note: This round contains 8 puzzles across 4 puzzle types. All puzzle types in this round are hybrids formed by fusing regular puzzle types with their own rule sets.
|1-2.||Skyscraper2 by Rohan Rao and Prasanna Seshadri, 10+70 points|
|3-4.||Spiral Galaxy2 by Rohan Rao, 25+30 points|
|5-6.||Araf2 by Prasanna Seshadri, 45+40 points|
|7-8.||Palindrome2 by Prasanna Seshadri and Deb Mohanty, 60+65 points|