Day 1 includes Terraria, Portal, Legend of Grimrock and Modern Warfare 3.
Prepare your virtual wallets for sustained abuse: Steam has launched its 2012 summer sale.
The main draw is the daily deals, with today's hefty bargains featuring Terraria for £1.49, Crusader Kings II for £7.49, Might & Magic Heroes VI for £14.99, Call of Duty: Modern Warfare 3 for £19.99, Shogun 2: Total War for £7.49, Ridge Racer Unbounded for £14.99, Indie Bundle I for £6.99, Legend of Grimrock for £4.79 and Portal 2 for £3.74.
Deals change every day at 18:00 GMT, where the Steam servers will promptly get overloaded and crash for at least half an hour.
As usual, there's a hefty selection of discounted publisher catalogues, too, with highlights including the Valve complete pack for £24.99 and the 2K Collection for £39.99.
This year the sale also includes Flash Deals which change every 8 hours, including a Community Choice selection where Steam users get to vote, from a list of three, on what their next deal is. Right now it's Trine 2 for £2.99.
Valve has also launched Steam Badges to coincide with the sale, adorning user profiles with shiny graphics if they complete certain tasks, such as taking a screenshot or recommending a game. Will Valve have some tricks and surprises in store for those who assemble a fine selection of badges, perhaps?