Science Adventure are a series of visual novels developed and published by 5pb., Nitroplus, and Chiyomaru Studio- including Chaos;Heads, Robotics;Notes, Occultic;Nine, and Steins;Gate.
The original Steins;Gate launched in 2009, leading to numerous other games, manga, and anime. Two of these games included Steins;Gate 0 and Steins;Gate Elite.
Details on Steins;Gate 0 Elite are scant at this time, but there is equal chance the game is a compilation of both 0 and Elite, or a brand-new game.
We will keep you informed as we learn more.