GreenManGaming is currently offering Batman: Arkham Knight with a 40% discount. This basically means that you can get this upcoming Batman game for 30 bucks, making this a really tempting offer.
This offer lasts until June 15th, 11.59pm.
All you have to do is use the following voucher code while purchasing the game from GMG (without quotation).
In addition, GreenManGaming is offering a 25% discount on all PC games (including GTA V and The Witcher 3, making this offer way better than the one found on Steam) until Friday 19th.
For a 25% discount, you can use this voucher code while purchasing the game from GMG.
You can get Batman: Arkham Knight from the following link.