Redesigning the Game Boy Advance once worked well for Nintendo. Now the company’s hoping it can strike gold again. The company unveiled the Game Boy Micro Tuesday, a smaller, lighter version of its most popular system. Measuring just four inches wide, two inches tall and less than an inch deep, the Micro weighs just 8 ounces, roughly the same as 80 paper clips. The machine will go on sale this fall. The company did not announce a sale price.