Vault-Tec Lab Journal

 is the handbook providing all the necessary information for playing the game. It is notable for including Vault Dweller's memoirs, which provide a rundown of the canonical actions of the Vault Dweller (and remind the players of the events of the previous game).

In downloaded versions, the manual is installed with the game in \Manual or available as a secondary download (eg. on GOG). It is also available for download locally.