Complete the Collection
The urge to collect all the items, achievements or secrets in a game.
The desire to collect things is a strong urge that game developers often exploit to get you to keep playing a game with the hope that one day you'll find all the rare items and have a complete set.
For people who collect things, the collection can have significant emotional value. It may connect them to something that they enjoy or feel strongly about. Some people collect for the thrill of the hunt, others may collect because it gives them a sense of security or control. Others may derive great satisfaction from having a complete set and feel anxious when they are missing a piece of a set.
All of these psychological effects contribute to making you keep playing the game, even if the "playing" of the game is not enjoyable anymore. If game developers are constantly releasing new content, then the players are always needing to "catch up" and may feel like they need to spend money to do so.
Sometimes reaching the 100% completion rating in a game can take hundreds of hours of additional tedious work beyond the normal scope of the game. Sometimes, some of the collectable items are only available via special events, and because players may have a fear of missing out on those items, they will continue playing and paying, even if the game is no longer fun.
For people who collect things, the collection can have significant emotional value. It may connect them to something that they enjoy or feel strongly about. Some people collect for the thrill of the hunt, others may collect because it gives them a sense of security or control. Others may derive great satisfaction from having a complete set and feel anxious when they are missing a piece of a set.
All of these psychological effects contribute to making you keep playing the game, even if the "playing" of the game is not enjoyable anymore. If game developers are constantly releasing new content, then the players are always needing to "catch up" and may feel like they need to spend money to do so.
Sometimes reaching the 100% completion rating in a game can take hundreds of hours of additional tedious work beyond the normal scope of the game. Sometimes, some of the collectable items are only available via special events, and because players may have a fear of missing out on those items, they will continue playing and paying, even if the game is no longer fun.
Examples
The World of Magic"Collection systems has a percentage of collectable items, based on said percentage you're given a position in the Ranking Board"
Angry Birds 2"You can complete clothing collections for an award"
Star Trek Timelines - Strategy RPG & Space Battles"Through gameplay you unlock different characters. There are more than 1,500 and they are generally in collections which you are encouraged to complete for rewards. The rewards often improve gameplay. With new characters released every week, 100% completion is unrealistic."
Soundmap: The Music Game"Badges for artist awards that you can out on your profile"
Pokémon Sleep"Collect different versions of sleeping pokemon"
Cut the Rope"9 ropes, more than 25 candies, 20 photos."
Honkai: Star Rail"Achievements are locked behind having limited-time 5 star characters"
Flutter: Starlight"Some collections have a quest to prefect them, all collections give you cosmetic items for completion. The compendium counts what you have vs. the total."
My Talking Tom Friends"pieces for albums you earn from card packs you earn from loot bags (see my review on loot boxes)"
Board Kings™️"sticker packs"