Shinobi Life 2, one of the largest games on Roblox, due to copyright issues. From the developers themselves, they believe that it is due to having copyrighted content in the game that has to do with Naruto and the company that controls that content. The game is not playable at the moment, and their group has been deleted from Roblox. It is currently unclear whether or not the game will return to Roblox or not, which could leave players who have spent a bunch of Robux out in the cold.
According to the developers, they were not given any warning and the game and group were just removed. If this is true, that's pretty unfortunate because they should have at least gotten a chance to remove any offending material from the game before having it completely removed. Not too long ago, the game Skyblocks had similar issues, and was removed from Roblox for a short-period. They then changed the name to Skyblox, which wasn't enough, and eventually landed on Islands. The game is now playable, which means that it is possible that Shinobi Life 2 could return to Roblox at some point.
The developers have stated that if the game doesn't return, they will move forward with another project called Shadow's Realm. We are hoping that Shinobi Life 2 will return, due to the fact that the game was quite popular on the platform, and seemed to be getting quite a bit of development thrown at it!
If you want to learn more about the situation, check out this video from the developers about what's going on.