Green Man Gaming offers a voucher good for 25% off most game downloads when you fill out a short form and verify your PlayFire-linked Steam ID. (Not a PlayFire member? It's free to join.) It beats our April mention of 20% off and is the first such voucher we've seen with PlayFire-linked IDs from GMG this year. Some titles may be excluded from this discount. It may take up to 48 hours for the voucher to arrive.