Nintendo’s latest venture in smartphone gaming, Animal Crossing: Pocket Camp, performed extremely well globally almost as soon as it launched.

It became the most downloaded iPhone app in the US within seven hours of being made available, and took ninth place in Japan’s highest grossing iPhone apps ranking in the same amount of time, Sensor Tower reported.

The app arrived in some markets including Austria, France, the US and the UK a day earlier than anticipated following a soft launch in Australia.

It was officially due for release in 40 countries on 22 November but appeared in some on 21 November.

According to Sensor Tower’s report, the app was the most downloaded iOS app in the US, Japan, Canada, France, Germany, Spain, Austria, and Luxembourg.

It also ranks in the top-ten most downloaded apps in the UK, Republic of Ireland, Switzerland, Italy, and Singapore.

However, many people reported problems including the appearance of an error code while playing the early version of the game. Such issues could be related to the game server being unable to handle the influx of users.

In October it was reported developers had to remake the game from scratch to ensure quality.

The app, which enables players to build campgrounds, is free-to-play, uses “leaf tickets” as in-game currency and needs “persistent internet” connection, similar to Super Mario Run.

When Super Mario Run was launched, Nintendo said the reason for this was security and the prevention of piracy.

The game was also optimised for the 5.8-inch display of Apple’s iPhone X.

Nintendo’s next mobile game is likely to be set within The Legend of Zelda universe.

Previously Nintendo launched MiitomoSuper Mario Run and Fire Emblem Heroes, but earnings from the apps in 2016 was modest: all told, they contributed JPY20 billion ($176 million) to total revenue of JPY489 billion.

Fire Emblem Heroes reached No. 5 on Japan’s top grossing iPhone chart in the same number of hours back at its launch in February.