Green Man Gaming takes up to 90% off downloads of a selection of action games for Windows, Mac, and Linux as part of its Summer Sale. Coupon code "GMGSUM-MERSAL-E20OFF" cuts an extra 20% off. Plus, select games are bundled with a free mystery game. Most games require a Steam account. A couple of best bets, with prices after coupon:

• Hard Reset: Extended Edition for for PC for $2.40 (low by $13)
• Doom 3: BFG Edition for PC for $4 (pictured, low by $16)