The urge to collect all the items, achievements or secrets in a game.
"There's like 15 playablee character, each needs 10 stars to unlock, which means 10 levels, and there's only one level a day. You cannot buy stars and there's no gameplay benefits to the characters, though. Just skins."
"There's no reward for collecting all of the 'gods' but it helps with the campaign alot more"
"There are 20 "Shiny Trinkets" scattered across the map to collect, and you get in-game music awards for getting more of them as well as unlocking a secret area with a unique minigame."