If you want to get your hands on the latest unlockable Batman costume in Arkham Knight, you might want to check how many vacation days you've got left, because you're going to need to take some serious time off.
According to Kotaku, the new Batsuit v8.05 – Prestige Edition only becomes available to players "after reaching 240% game completion" which, as any mathematician will tell you, is quite the undertaking.
Check out the 'Arkham Knight' trailer below:
In practical terms, this means you have to fully complete the game twice, with the second run-through starting via the New Game+ option. However, this will only get you to 200%. To grab that final 40%, you'll have to complete the Seasons of Infinity expansion that is being rolled out in Decembers DLC release.
Of course, if you're playing on PC, there is a much easier way to get your hands on the 'Golden Batsuit'. Instead of doing all that pesky game playing, you can simple tweak around with the backroom game files and codes and unlock the suit that way. If you're playing on consoles though, I'm afraid you have to do it the ol' fashioned way.