Digital distributors are embracing the Halloween spirit with huge savings on horror-themed titles. Although Steam seems to have the largest selection, many of the major games such as Dead Space, Dead Island, Killing Floor, Amnesia: The Dark Descent and others are available through most of Valve's competitors. However, we tried to avoid repeating those entries to keep the list as diverse as possible. As a side note, there is an event similar to the Humble Indie Bundle running over at Indie Royale.
Steam
{pf id:36702 size:small} Dead Space Pack $13.59 (66% off)
{pf id:2831 size:small} Left 4 Dead 2 $6.79 (66% off)
{pf id:1452 size:small} Borderlands: GotY $7.49 (75% off)
{pf id:1392 size:small} BioShock & BioShock 2 $4.99 (75% off)
{pf id:80319 size:small} Dead Island $37.49 (25% off)
{pf id:2763 size:small} Killing Floor Bundle $10.17 (66% off)
{pf id:3712 size:small} S.T.A.L.K.E.R. Bundle $8.74 (75% off)
{pf id:3356 size:small} Painkiller Complete Pack $10.17 (66% off)
{pf id:1165 size:small} Amnesia: The Dark Descent $4.00 (80% off)
{pf id:3341 size:small} Overlord Complete Pack $4.99 (75% off)
{pf id:3617 size:small} Resident Evil 5 $9.99 (50% off)
{pf id:2170 size:small} F.E.A.R. Collection $6.79
{pf id:36909 size:small} F.E.A.R. 3 $29.99 (40% off)
{pf id:4146 size:small} Terraria $4.99 (50% off)
{pf id:2397 size:small} Ghostbusters: The Video Game $2.49 (75% off)
{pf id:1906 size:small} Devil May Cry 4 $9.99 (50% off)
{pf id:3871 size:small} Silent Hill Homecoming $13.59 (66% off)
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Impulse
{pf id:3058 size:small} Metro 2033 $9.99 (50% off -- Fri. only)
{pf id:36606 size:small} Command and Conquer 4 $9.99 (50% off -- Sat. only)
{pf id:3086 size:small} Mirror's Edge $9.99 (50% off - Sun. only)
{pf id:36271 size:small} Alice: Madness Returns $14.99 (50% off)
{pf id:3645 size:small} Rift $9.99 (66% off)
{pf id:2396 size:small} Ghostbusters: Sanctum of Slime $4.99 (50% off)
{pf id:38269 size:small} Trapped Dead $4.99 (50% off)
{pf id:4111 size:small} Sword of the Stars Complete Collection $8.99 (55% off)
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GamersGate
{pf id:1127 size:small} Aliens vs. Predator $6.78 (83% off)
{pf id:1316 size:small} Batman: Arkham Asylum GotY $6.79 (66% off)
{pf id:2845 size:small} Lego Batman: The Video Game $6.78 (66% off)
{pf id:1761 size:small} Cryostatis: Sleep of Reason $4.40 (66% off)
{pf id:1800 size:small} Dark Fall: Lost Souls $6.66 (67% off)
{pf id:3394 size:small} Penumbra Collection $5.00 (75% off)
{pf id:3211 size:small} NecroVision Hardcore Edition $8.48 (66% off)
{pf id:1934 size:small} Disciples III: Renaissance $7.49 (75% off)
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Direct2Drive
{pf id:1539 size:small} Call of Juarez: Bound in Blood $4.95 (75% off)
{pf id:80410 size:small} Hard Reset $14.95 (50% off)
{pf id:36360 size:small} Assassin's Creed: Brotherhood $19.95 (50% off)
{pf id:3188 size:small} Total War Deluxe $44.95 (50% off)
Fort Zombie $2.50 (75% off)
{pf id:2536 size:small} Haunted House $4.95 (75% off)
Fishdom: Spooky Splash $1.75 (75% off)
Vampire: The Masquerade - Bloodlines $4.95 (75% off)
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Origin
{pf id:3881 size:small} SimCity 4 Deluxe Edition $9.99 (50% off)
Good Old Games
50% off "Spooky" games
https://www.techspot.com/news/46064-weekend-game-deals-trick-or-treat.html