A side-story follows the Hoshino family as the Prince works at his tasks. The father, an astronaut, is unable to go to the moon after it is wiped out by the King, and the daughter, whose name is Michiru, "senses" the Prince's work—she can feel when each constellation returns to the sky. Ultimately, the family, along with their house and town, are rolled up in the katamari that is used to remake the moon.
Gameplay
The player controls the Prince as he rolls the katamari around houses, gardens, and towns in order to meet certain parameters set by the King of All Cosmos. The player uses the two analog sticks on the DualShock controller in a manner similar to the classic arcade game Battlezone to control the direction the katamari rolls. Other controls can be triggered by the player to gain a quick burst of speed, flip the Prince to the other side of the katamari and more.
Objects that are smaller than the katamari will stick to it when the player comes into contact with them, while greater objects can be hurdles; colliding at high speed with any may cause objects to fall off the katamari, slowing the player's progress. The game uses size, weight, and surface area to determine if an object will stick to the katamari. This allows slender objects, such as pencils, that are longer than the katamari is wide, to be picked up, and these will alter how the katamari rolls until more objects are picked up. Animals such as cats will chase the katamari, knocking things from it, but once the katamari is great enough, it will scare the animals away, and they can be rolled up once they are chased down. As objects stick to the katamari, the katamari will grow, eventually allowing objects that were once hurdles to be picked up, and creating access to areas that were formerly blocked. In this manner, the player might start the game by picking up thumbtacks and ants, and slowly work up to the point where the katamari is picking up buildings, mountains, and clouds.
The typical mission given by the King of All Cosmos is the "Make a Star" mode, where the player needs to grow the katamari to a specific size within a given time frame. Other missions have more specific collecting rules, such as collecting as many items (swans, crabs, pairs) as possible within a given time, or collecting the largest item possible (such as a cow or bear). The player can attempt a score attack mode for any level, in which they try to make the largest katamari possible in the time allotted. Certain levels can unlock an "eternal mode" by creating an exceptionally large katamari. In eternal modes, the player can explore the level with no time limit.
Each level features two secret items that can be found. The first item is a royal present that contains an object that the Prince can wear. Most gifts are non-functional, but one includes a camera that can be used to take in-game screenshots. The other secret item is a cousin of the Prince, which, once rolled up in main gameplay, can be used as a character in the various multiplayer modes. However, cousins can only be found and rolled up after the game is beaten. The game also tracks which objects the player has collected at any time, allowing them to review all the various objects within the game.
In the two-player mode, a player can choose to play as either the Prince or one of his numerous Cousins. The screen is split vertically; player one on the left and player two on the right. Players compete simultaneously in a small arena to collect the most objects within three minutes. The playing field is replenished with new objects periodically. Players can ram into each other, knocking items from their opponents' katamaris, and if one player leads by a fair amount, then it is possible to roll up the opponent's katamari.
Reception
Katamari Damacy enjoyed moderate success in Japan. The game was sold at about two-thirds of the price of a new game at the time. It was the top selling game the week of its release with 32,000 units sold, and sold over 155,000 copies in Japan by the end of 2004. However, Namco originally estimated that over 500,000 units would be sold in Japan.
The game was not released in PAL territories such as Europe and Australia since publishers thought it was too "quirky" for these markets; however, Electronic Arts picked up both sequels, We Love Katamari and Me & My Katamari, for release in Europe.
The North American release of the game was very well received by professional reviewers, was mentioned and praised on TechTV, and was a featured sidebar in the May 23, 2004, edition of Time magazine. Time continued to praise the game in its November 22, 2004 "Best games of the year" special, calling it "the most unusual and original game to hit PlayStation2". Most retailers underestimated the demand for such a quirky game, and only purchased a few copies of this sleeper hit; it rapidly sold out nationwide, with sales surpassing 120,000 units in North America. It also won the U.S. award for "Excellence in Game Design" at the 2005 Game Developers Choice Awards, and G4 awarded Katamari Damacy its "Best Innovation" prize in its G-Phoria of that year. Katamari Damacy was one of the recipients of the 2004 Good Design Award in Japan, the first time a video game has won this award. In 2015, the game placed 13th on USgamer's The 15 Best Games Since 2000 list.
Although the game has rapidly achieved a cult following and has been praised by many reviewers, it also has its share of criticism. A common complaint is that the game is relatively short and repetitive—it can be completed in under ten hours, and the gameplay stays virtually the same all the way through. However, others, such as Electronic Gaming Monthly reviewer Mark McDonald (who gave the game 8.5 out of ten with his EGM staff), argue that the game's limitations are made up for by its strengths: "Sure, you're basically doing the same thing each mission, but Katamari's elegant controls, killer soundtrack, and wicked humor make it perfectly suited for replay." As a well-executed, non-traditional game, Katamari Damacy has been influential in the game development community. Since its release, a number of designers have developed works inspired by Katamari: one example is The Wonderful End of the World.