You can find all the current promo vouchers, discount codes directly on the official site MCW to ensure they are valid. I personally check this page every Friday before I start my weekend session. They have some really good offers that can significantly increase your balance with just a small deposit. I once got a voucher for some free spins on Crazy Monkey and it turned into a nice win. The process is very simple, you just copy the code and paste it when you are making your deposit. It is a very transparent system and they clearly show you what you will get. I have never had a problem with a code not working if it was taken from the official site. It is definitely worth the extra few seconds to check.