However, due to technical difficulties, player progress can not be transferable to the new version. On October 9, 2022, a new updated version of the game was released featuring new gameplay, features, storylines and characters.

The game has a Chinese version and a global 'SEA' version which features English. The game has been translated into English and is available for download online, although it has not been officially released in Western markets. It became available to Indonesia, Malaysia, the Philippines, Singapore, Thailand, South Korea, and Japan under Gaea Mobile on June 1, 2020.

It was announced at the end of May 2019, and was first made available to China, Macau, Hong Kong, and Taiwan. It is the sequel to Fallout Shelter and also serves as a prequel to Fallout 4 as well as a sequel to Fallout 3. Fallout Shelter Online (辐射避难所 Online) is a free-to-play mobile game developed by Chinese studio Shengqu Games, published by Bethesda Softworks, and currently distributed by Gaea Mobile.

Fallout shelter pet legendary training