The urge to collect all the items, achievements or secrets in a game.
"Challenges. Challenges come in sets of 9, in a 3×3 layout. If you complete a challenge, you get a small reward, but if you complete a row, column or diagonal of challenges, you get an additional reward, and if you complete all nine, you get another reward: a badge, a ticket, some rubies. And in races, you can earn 500"
"There are a limited number of Foundables. Some very very rare. The point of the game is to collect them all. Not sure if it's actually possible."
"Vaguely yes, there’s mentions of collecting them all and the goal is simply to collect."
"There is a museum that when you get certain items you can complete for more items or characters."
"Rarer cards tend to show up more frequently when you near the end of collecting a set."
"There are hundreds of characters that are obtained either through a random draw or through real money."