"Sums Stacker" is a captivating challenge within the renowned "Math Doodles" series, tailored for iPhone/iPodTouch screens. It offers an engaging way to practice addition and subtraction skills while enhancing number sense through various representations. The game features two modes of play, 'solve' and 'race,' along with easy and hard difficulty levels.

In 'Solve Mode,' players strategically solve five sets with smiley faces as rewards, while 'Race Mode' challenges them to accumulate points before time runs out. The puzzle involves rearranging numerals to match target sums, displayed in different representations such as dice, fingers, Roman numerals, and more. With accolades from reputable sources and a focus on math enjoyment, "Sums Stacker" is a delightful and educational math experience.