EQUALINE on SteamEQUALINE is a "one-stroke calculation puzzle" where you have to connect numbers and symbols with lines to complete a calculation. There is only one correct answer for each combination of nine squares, and the target number increases with each puzzle. It's a highly competitive action puzzle game.
らっぱ王子：並べなおすと１マス減る三角形のトリックを視覚的に解析
Engadget | Technology News & Reviews
CiNii - ぷよぷよはNP完全
