In June 2015 , '' Sea of Thieves '' was announced at Microsoft 's Xbox press conference at the Electronic Entertainment Expo 2015 ( E3 ) . Gameplay was first shown at E3 2016 . The game was scheduled to launch on Windows and Xbox One in 2017 , but it was delayed until 20 March 2018 . The game is part of Microsoft 's Xbox Play Anywhere cross-buy program , meaning that purchasers of the downloadable version of the game can play the game on both a Windows 10 computer and an Xbox One . Additionally , the game is playable at launch for those subscribed to Xbox Game Pass
E3 2016
E3 2016
Sea of Thieves