Best deals of the Halloween Steam Sale [ENDED]

What are the best deals you've found on this Halloween Steam Sale? New historic minimums for excellent titles? Post them here!

CURRENT STATUS: Ended! Thanks to everyone who participated in the thread ^^

Browse, save money (or don't spend it at all), or just discover interesting titles... above all, have fun!

Wishing everyone a good Halloween / All-Hallows / Dia de los Muertos / Samhain season, whether in celebration or introspection.

27/10/2017: Sale has begun. Seems Steam is having trouble updating the store values (not even showing up on the wishlist page yet).
28/10/2017: Prices now seem to be stable. Some new deals apparently pop up, while a few disappear, but most last until the 1st of November.
29/10/2017: The "Extended SteamGifts" (ESG) script has updated, adding Steam Widgets. While quite the useful feature, seems it has wreaked supreme havoc in the legibility of some parts of the thread :) In case you're wondering, it's tied to option #13 in the ESG configurations.
30/10/2017: A few deals are already disappearing. Some examples: Songbringer is now at only -25% (from the original -75%), while Neon Drive is no longer discounted (reduction only lasted the first day of the sale).
01/11/2017: Aaaaaand, it's done :) The Halloween Steam Sale has come to an end! Next one is the Steam Autumn / Black Friday (expected to run from the 22nd of November to 28th of November).

Here is a list with some of the most interesting deals, that I've seen and/or that have been shared by fellow SG'ers.

EDIT: Besides this list, which is still ongoing, check out the original comments below for many more excellent titles. Our beloved SG community is awesome at finding good opportunities and deals, much faster than this list can be updated, so be sure to take a look at those too.

• Spelunky: -90% 💖
• Crypt of the Necrodancer: -80% (sadly, only -33% on Amplified)
• Alone in the Dark Anthology: -75%
• Amnesia Collection: -90% (currently available on GOG-Connect, as Mihey3Z well pointed out)
• The Gate of Firmament: -70%
• Necropolis - Brutal Edition: -85%
• SOMA: -75% (currently available on GOG-Connect, as pointed by thegodoftisandwine)
• Amphora: -75%
• Penumbra Collector Pack: -90% (apparently also includes Requiem, as part of Gold Edition)
• Songbringer: -25% (was originally at -75% when the sale started)
• Dex: -85%
• Crusader Kings II: -75%
• Europa Universalis IV: -75%
• Bot Vice: -80%
• Strikey Sisters: -80%
• Introversion Complete Bundle: -89% (or just Prison Architect at -75%, not a large difference)
• Death's Hangover: -90%
• Stories: The Path of Destinies: -80%
• Ironclads 2 Collection: -88%
• Ironclads & Victorian Admirals: 10 in 1 Bundle: -93% (complete Ironclad collection plus Victorian Admirals, at just a small price difference)
• Hollow Knight: -34% (not a large discount, but an excellent 2017 game)
• Escape Goat 2: -75%
• Roots of Insanity: -85%
• Slap Village: -75%
• Aquaria: -80%
• Polywings: -80%
• Shadowrun Collection: -85%
• Milkmaid of the Milky Way: -50%
• Metro Redux Bundle: -81%
• Fate Tectonics: -90%
• Trials of Azra: -80% (game with an interesting mechanic)
• The Happy Hereafter: -87%
• Sleeping Dogs - Definitive Edition: -85%
• Shelter: -90%
• Don't Starve - Mega Pack: -66%
• Zombie Driver HD Complete Collection: -90% (if you choose the regular edition it's even cheaper, personally I chose the complete)
• Eye: Divine Cybermancy: -80%
• The Swapper: -81%
• PopCap Power Pack: -79% (full pack is a bit expensive, but it has nice individual deals if you just like some of them)
• The Vanishing of Ethan Carter: -80%
• Zombie Army Trilogy: -80%

Also, as you may have noticed, the list is getting a bit unmanageable due to the sheer volume of deals, and I'm adding just a few at a time as I get the chance (no specific criteria). In order to help, some users took the time to prepare extensive lists with links, so I'm also quick-linking their comments... doing this co-op is a far more cost-effective way to handle the crowdsourcing of information. If you want to help, make your lists in a single comment and I'll highlight them up here until the main gets updated with those titles (the text lists below each show those not yet added).

Fahrenheit86, here

• Fran Bow - Enhanced Steam tells it's the lowest price for this masterpiece ever (at least in Russia)
• The Black Watchmen - the lowest price ever
• Rebel Galaxy - 75% OFF
• Razenroth - almost free in Russia with 88% OFF
• Resident Evil - Biohazard HD REMASTER - the lowest price ever
• Explorers Bundle - while still expensive, it's probably the best deal you can get if you're into this kind of games

JeffHowe, here

• Locoland 90% off
• Time in Time 83% off
• Cetabula 75% off
• Finders 90% off
• Residue Final Cut 75% off
• Word Wonders 90% off
• Rescue Team 1 90% off

SkyCycle, here ⚠️

• Behind the Memory - 75% off to 0.99€
• This War of Mine: The Little Ones DLC - 60% off to 1.99€
• Dear Esther: Landmark Edition - 75% off to 2,49€
• Teleglitch: Die More Edition - 80% off to 2,59€
• LA Cops - 75% off to 3,49€
• Dungeon Rats - 50% off to 4,49€
• Serpent in the Staglands - 70% off to 5.99€
• Beholder: Ministerial Bundle - 45% off to 2.19€ for the DLC on its own, but if you own Beholder it's down to 1,75€
• Renowned Explorers: Complete Bundle - both DLCs for 8,74€ instead of 10.93€ if you own the base game

DavideGendo, here (also, previously here) ⚠️

• Valley, -75%
• Gunhound EX, -75%
• Antichamber, -80%
• Heart&Slash, -75%
• GoNNER, -70%
• Venetica, -70%
• Trillion: Gof of Destruction, -85%
• The Way, -70%
• Astebreed, -67%
• Retro Army - Complete Collection
• Dreaming Sarah, -90%.
• EDGE, -90%
• The Tiny Bang Story, -80%
• Feral Fury, -80%
• Eldritch, -90%
• Super Splatters, -80%

Jiseru, here

• paint it back $3.99
• blockwick 2 $3.99
• full bore $3.74
• castle in the darkness $3.29
• Knytt Underground $2.79

VEF215, here

• Fortified
• Ben and Ed: Blood Party
• Wand Wars
• Monstrum
• The Deadly Tower of Monsters

VovanVV1982, here ⚠️

• -90 Castle Werewolf
• -85 Fishermurs
• -85 Middle Earth Hero
• -85 Insane Decay of Mind
• -80 Devil In The Capital
• -80 Neon Drive (LOWEST RECORDED PRICE ABOUT 7 HOURS AGO)
• -90 Psychical Madness
• -81 The World II: Hunting BOSS
• -81 Tungulus
• -80 After Life - Story of a Father
• -80 Camp Sunshine
• -80 Primal Carnage: Onslaught
• -80 A Dump in the Dark
• -89 Boogeyman_1__2_Double_Pack
• -80 CALENDULA
• -80 Phantasmal
• -75 GUILTY GEAR Xrd -SIGN- Big Blast Bundle
• -60 Phantaruk
• -66 The Crow's Eye
• -82 Depth: Abyssal Bundle
• -75 Talewind
• -73 2Dark Deluxe Edition
• -50 Voodoo Vince: Remastered
• -50 Dungeon Rats
• -50 White Day: A Labyrinth Named School
• -50-60 Downfall
• -55-57 Yomawari: Night Alone
• -71 The Zombie Survival Bundle
• -60 Aragami
• -68 Steve Jackson's Sorcery! - The Complete Collection
• -60 No70: Eye of Basir
• -81 Chilled Mouse RPG Bundle (Warhammer Quest Deluxe, Torn Tales)
• -70 Spectrum: First Light
• -50 Phantom Halls
• -50 Azure Striker Gunvolt
• -50 TZOMPANTLI
• -72 The East New World
• -75 Ballistic Overkill

Robilar5500 (with link list added by Shindo), here

• Catacombs 1: Demon War - $0.89
• Sunset Rangers - $5.99
• A House of Many Doors - $5.49
• Metal as Phuk - $2.99
• Flamebreak - $1.99
• The Adventures of Fei Duanmu 端木斐异闻录 - $2.79
• Pathfinder Adventures - Obsidian Edition - $23.99
• Lotia - $4.49
• Saucer-Like - $1.79
• Firewood - $1.69
• Firewood Soundtrack - $0.42
• Xenoraid: The First Space War - $2.69
• Time Recoil - $7.55
• Yesterday Origins - $3.46
• PlayClaw 5 - $22.09
• PlayClaw 5 - Streamer Pack - $0.84
• PlayClaw 5 - Chroma Key for Overlays - $0.84
• Wailing Heights - $4.24
• Wailing Heights - Original Soundtrack and PDF Comic Artbook - $2.54
• Obduction - $11.99
• DOG GONE GOLFING - $0.51
• Coffee Pot Terrarium - $0.99

UPDATE 1: Note that in some case, buying the games separately can get you a better discounts than packs! Here are some examples:

• Found by TheLuckyShamrock: "The Ankh Pack is 75% off, but if you buy Ankh 2 and Ankh 3 separately, they're much cheaper, because they're 85% off each (so, buy these 2 games separately)."
• Found by Myrsan: "If you own everything else of the Adventure Discovery Bundle pack, Yesterday Origins costs only 3,46 € (otherwise it is at 4.94€)."
• Found by lovol: "If you have one Metro game the other one is 3,74 when buying a pack."
• Found by Gearmos: "Dead Space + Dead Space 2 individually are cheaper than the two-pack." (PrivateJokerGen informs that in RU/CIS region this does not apply, the pack being cheaper)

UPDATE 2: On the other hand, when it comes to DLC's, remember to look for Season Passes, which can be better than separate DLC's:

• Alien Isolation Season Pass costs less than the sum of its DLC's, but be aware that it does not include two of them (the lowest priced ones). Still, a good deal.

UPDATE 3: If you're patient and like to shop around first, watch for cross-store deals. Some people have already been able to find titles being sold at better prices on other digital stores outside of Steam.

• Deals found by Myrsan: Yesterday Origins, Crusader Kings 2, Europa Universalis IV