In a post on the PlayStation Blog, Untitled Goose Game developer House House breaks down how they added multiplayer to the game.

"For a start, we had to make a new goose. In terms of looks, we knew that players would need to be able to tell the two geese apart, but we also liked the idea that the characters in the game couldn’t really tell them apart," said House House's Nico Disseldorp. "So we tried to find a way to make this goose look different in its details, but in overall terms look pretty much like the same kind of goose."

To make the second goose different, Disseldorp said they added an extra bump on its beak, made the goose softer and rounder, and tweaked the honk to make it sound different. Another fun thing they added is making the human characters smarter in order to tell the geese apart. Disseldorp added they had to balance things like making sure the humans can catch both geese, while also providing them chances to help each other escape. Additionally, the mode supports local multiplayer but you also have the option of playing with the second player online.

"After the game’s release last year, we had an opportunity to do some more work on the game," continued Disseldorp. "One of our favorite things about the response to the game was how many people were playing together with their friends, watching or taking turns. So we decided that the most exciting thing for us would be to add that second goose into the game."

Untitled Goose Game released on the Nintendo Switch and Epic Games Store last year. Between its release on those platforms plus PS4 and Xbox One, the game went onto sell a million copies in its first three months. Last month, the game's multiplayer mode was announced during Nintendo's Indie World Showcase. Additionally, physical versions of the game are up for preorder now from iam8bit.

Untitled Goose Game is available now on PlayStation 4, Xbox One, Nintendo Switch, and PC. You can watch a trailer for the game below.