https://www.humblebundle.com/store/grid-free-game

http://gtm.you1.cn/storesteam/app/57300/

24 hours only

1. Vote here : http://www.gamesradar.com/goldenjoystickawards/vote/
2. Claim here : https://goldenjoysticks.greenmangaming.com/

This is only while stock lasts

If you got "UNABLE TO ADD VOUCHER" change your GMG account, re-check and make sure you log in to GMG with the right account
GMG account email must be the email address that you claim your discount code with

https://www.humblebundle.com/store/p/stealthinc2_agameofclones_freegame

http://www.greenmangaming.com/s/us/en/pc/games/shooter/metro-redux-bundle/#b

Use this promo code in checkout SAVE23-WITHGM-GAUG15