Steam's Holiday Sale is relentless on day four, kicking off with a bundle of Portal and Portal 2 for 75 percent off, or just $6.25. Also on sale is Anno 2070 ($20), Chivalry: Medieval Warfare ($12.50), Saints Row: The Third - The Full Package ($7.50), Super Street Fighter 4 Arcade Edition Complete Pack ($13.50) and Carrier Command: Gaea Mission ($25).

These games are on sale for two days, while yesterday's deals have one day remaining. The publisher and indie packs are still good for the grabbing, as are the quick-time flash sales.