Stronghold 3 Gold $7.50 at GMG. Activates on Steam By w00py | November 12, 2012 0 Comment Looks like Green Man Gaming is running daily deals again. Stronghold 3 Gold is the daily deal for 11/12/12 at $9.99 (80% off). Use the voucher code GMG25-UAAHK-6AI9S and the price drops another 25% off, which makes it $7.50. The game uses Steamworks, so Steam activation is required.