Thank you for providing this list! :)

And all of them are back to the higher prices. :/

Sorry, looks like GOG cannot make their minds about these discounts...

Probably...

But in real news, the spreadsheet is updated for the day including a "New Additions" tab which displays discounts which have been added or changed since the beginning of the sale.

Today's Additions (or price changes):
Army Men
Army Men II
Army Men RTS
Army Men: Toys in Space
CivCity: Rome
Freedom Force
Freedom Force vs. the 3rd Reich
Hidden & Dangerous 2: Courage Under Fire
Hidden & Dangerous Action Pack
Hyperdimension Neptunia Re;Birth1 – DLC Pack
Hyperdimension Neptunia Re;Birth2: Sisters Generation - DLC Pack
Hyperdimension Neptunia Re;Birth3 V Generation - DLC Pack
Kerbal Space Program
Kerbal Space Program: Making History
MachiaVillain
Mafia
Mafia II: Director’s Cut
Mafia III
Mafia III Deluxe Edition
Mafia III: Family Kick Back Pack
Mafia III: Faster, Baby!
Mafia III: Sign of the Times
Mafia III: Stones Unturned
Railroad Tycoon 2 Platinum
Railroad Tycoon 3
Sid Meier's Civilization IV®: The Complete Edition
Sid Meier's Civilization® III Complete
Sid Meier's Pirates!
Sid Meier's Railroads!
X-Com: Apocalypse
X-Com: Enforcer
X-Com: Interceptor
X-COM: Terror from the Deep
X-Com: UFO Defense

Two new stealth additions to the summer sale today
Maniac Mansion (66% off - new historical GoG low, previous best 33% off)
The Curse of Monkey Island™ (25% off - matching the previous best for owners of the other Monkey Island games)

Up to date with the new additions:

Albedo: Eyes from Outer Space
Commandos 2+3
Commandos Ammo Pack
Creatures Exodus
Creatures Village
Creatures: The Albian Years
FAR: Lone Sails (1st time on sale - 10%)
FAR: Lone Sails - Digital Artbook (1st time on sale - 10%)
FAR: Lone Sails - Soundtrack (1st time on sale - 10%)
Imperial Glory
MachiaVillain (Back to 20% off - again)
Mages of Mystralia
Mages of Mystralia - Original Soundtrack
Mainlining
Mainlining: Deluxe Edition Upgrade (Historical best - 85% vs 75%)
Nantucket (Historical best - 20% vs 10%)
Praetorians
RIOT - Civil Unrest (Historical best - 20% vs 10%)
The Long Reach
The Long Reach - Soundtrack
We Happy Few
Ziggurat (FREE - front page)

All this info is very helpful. Thank you.

Thanks! I was looking for that information.

New games were added 2 hours later than usual:

Here is the list:
Aragami
Aragami - Collector's Edition Upgrade
Aragami: Nightfall
Hammerwatch
Heroes of Hammerwatch
Homeworld: Deserts of Kharak
Homeworld: Deserts of Kharak - Expedition Guide
Homeworld: Deserts of Kharak - Khaaneph Fleet Pack
Homeworld: Deserts of Kharak - Soban Fleet Pack
Homeworld: Deserts of Kharak - Soundtrack
HuniePop
HuniePop - Deluxe Edition Upgrade
Hyper Light Drifter
INSIDE
LIMBO
Oddworld: Abe's Exoddus
Oddworld: Abe's Oddysee
Oddworld: Munch's Oddysee
Oddworld: New 'n' Tasty - Alf's Escape
Oddworld: New 'n' Tasty - Scrub Abe
Oddworld: New 'n' Tasty
Oddworld: Stranger's Wrath HD
Outlast
Outlast 2
Outlast: Whistleblower
Sir, You Are Being Hunted
Surviving Mars
Surviving Mars - Digital Deluxe Edition
Surviving Mars - Digital Deluxe Edition Upgrade Pack
Surviving Mars - First Colony Edition
Surviving Mars - Season Pass
Tales of Maj'eyal
Tales of Maj'eyal: Ashes of Urh'rok
Tales of Maj'eyal: Embers of Rage
Tales of Maj'Eyal: Forbidden Cults
The Signal From Tölva

Thanks for doing this!

Spreadsheet up to date:

New additions & changes:
BIT.TRIP BEAT
BIT.TRIP BEAT Soundtrack
BIT.TRIP CORE
BIT.TRIP CORE Soundtrack
BIT.TRIP FATE
BIT.TRIP FATE Soundtrack
BIT.TRIP FLUX
BIT.TRIP FLUX Soundtrack
BIT.TRIP Presents... Runner2: Future Legend of Rhythm Alien
BIT.TRIP Presents... Runner2: Future Legend of Rhythm Alien Soundtrack
BIT.TRIP Runner
BIT.TRIP Runner Soundtrack
BIT.TRIP VOID
BIT.TRIP VOID Soundtrack
Caveblazers [NEW RELEASE]
Caveblazers - Arena Mode [NEW RELEASE]
Darkwood
eden*
Evoland
Evoland 2 Deluxe Edition
Evoland 2 Deluxe Edition Upgrade
Evoland 2, A Slight Case of Spacetime Continuum Disorder
fault - milestone one
fault - milestone two side:above
Higurashi When They Cry Hou - Ch.1 Onikakushi [Historic low - 75% vs 25% off]
Higurashi When They Cry Hou - Ch.2 Watanagashi [Historic low - 50% vs 25% off]
Higurashi When They Cry Hou - Ch.3 Tatarigoroshi [Historic low - 50% vs 25% off]
Higurashi When They Cry Hou - Ch.4 Himatsubushi [Historic low - 50% vs 25% off]
Higurashi When They Cry Hou - Ch.5 Meakashi [Historic low - 50% vs 25% off]
Metro 2033 Redux [Sale price rise - 66% vs 75% off]
Metro: Last Light Redux [Sale price rise - 66% vs 75% off]
SteamWorld Dig
SteamWorld Dig 2
SteamWorld Dig 2 OST Feat. El Huervo [Historic low - 50% vs 25% off]
SteamWorld Heist
SteamWorld Heist - Hatbox: Hatful Eight +2
SteamWorld Heist: The Outsider
Sunrider Academy
Sunrider: Liberation Day - Captain's Edition
Tharsis

Thanks!

thank you, great info in best representation!

New additions today:

Alien Breed + Tower Assault (85%)
Real Myst (70%) [Leaving catalog at end of sale]
Sheltered (75%)
The Escapists (75%)
The Escapists: Alcatraz (60%)
The Escapists: Duct Tapes Are Forever (75%)
The Escapists: Escape Team (75%)
The Escapists: Fhurst Peak Correctional Facility (10%)
The Escapists: The Walking Dead (75%)
The Escapists: The Walking Dead - Deluxe Edition Upgrade (50%)
The Flame in the Flood (70%) [Historical low - 65% previously]
Ultimate Body Blows (80%)
World Rally Fever: Born on the Road (80%)
Worms 2 (80%)
Worms Forts: Under Siege (80%)
Worms United (80%)
Worms W.M.D. (66%)
Worms World Party Remastered (76%)
Worms: Armageddon (80%)
XCOM: Enemy Unknown Complete Pack (80%) [New release]
Ys VIII: Lacrimosa of DANA - Ultimate Resource Bundle (7%)

The only new addition I found is the newly released...
Kingdom Come: Deliverance Pack (20% off)