

The Infectious Madness of Doctor Dekker
D'Avekki Studios Ltd · May 19, 2017 · FMV, Lovecraftian, Atmospheric, Dark, Indie
Buy the The Infectious Madness of Doctor Dekker key for Steam from Kinguin at $2.58 — the cheapest of 9 stores we compare.
Where to buy The Infectious Madness of Doctor Dekker — official stores
Cheapest The Infectious Madness of Doctor Dekker keys — keyshops
Keyshops are third-party marketplaces — keys are resold and can be region-locked or a different edition. Check the listing's region & edition before buying.
Some store links are affiliate links — playze may earn a commission at no extra cost to you. It never changes the price you pay, and the cheapest confirmed price is always shown in the Best price box above.
The Infectious Madness of Doctor Dekker price by region
The Infectious Madness of Doctor Dekker costs $1.73 in Georgia (USD), £2.02 in the United Kingdom, $2.58 in the United States, €2.60 in Europe (EUR), CA$2.99 in Canada, A$3.82 in Australia, NZ$3.84 in New Zealand, R$5.39 in Brazil and zł9.89 in Poland right now.
| Region | Best price | Official store | Key shop | Stores |
|---|---|---|---|---|
| $1.73 −71% | $1.73 | $2.58 | 9 | |
| £2.02 −71% | £2.02 | £2.51 | 7 | |
| $2.58 −71% | $2.60 | $2.58 | 9 | |
| €2.60 −71% | €2.60 | €2.89 | 8 | |
| CA$2.99 −71% | CA$2.99 | — | 4 | |
| A$3.82 −71% | A$3.82 | — | 4 | |
| NZ$3.84 −71% | NZ$3.84 | — | 4 | |
| R$5.39 −71% | R$5.39 | R$17.67 | 5 | |
| zł9.89 −71% | zł9.89 | zł15.33 | 6 |
Each row is a real price from that region's own stores, not a currency conversion, so the figures are not directly comparable. Switch regions in the header to shop the one you buy in.
Screenshots
About The Infectious Madness of Doctor Dekker
Type any question - and your patients will reply in full screen video.
They'll have questions for you too but be careful what you say. Your words will determine their eventual fates, and your own!
MAIN FEATURES
- FMV! - 1600+ full screen HD video responses
- FREE TEXT INPUT - Ask whatever you want, type questions, phrases or just keywords.
- SUGGESTED QUESTIONS - No keyboard? No problem. Pick from our suggested list.
- MULTIPLE ENDINGS - Find out whodunit, and what happens to you and your patients...
- MULTIPLE STORIES - 6 main suspects and 5 side-quests inc. John Guilor (Contradiction)
- RANDOM MURDERER - Chosen at the start of the game to combat spoilers
- SIMPLE UI - View evidence, make notes, watch replays, see your question history
- ACHIEVEMENTS - Steam achievements and a dynamic descriptive rating system
- GUINNESS WORLD RECORD - for "The most Full Motion Video (FMV) in a videogame"
WARNING - This game contains mature themes and psychological horror (including sexual themes, violence and suicide) and by its very nature is open to wide interpretation - so although not originally intended, some topics such as rape and parricide can also be inferred. Recommended for adults only.
FULL DETAILS
The Infectious Madness of Doctor Dekker is a Lovecraftian FMV murder mystery, which gives players full freedom to question suspects by typing their own questions instead of picking them from a predetermined list. There are no point and click puzzles to solve, just questions to ask and evidence to inspect.
Finding out who killed Dr Dekker is only one part of the puzzle; working out how to fix the chaos he left behind will be so much trickier… As well as providing clues to the murder, each patient has their own bizarre problem they need your help with – from time manipulation and re-animated loved ones to horrors under the sea.
Complete with an atmospheric soundtrack, The Infectious Madness of Doctor Dekker invites you to explore the shadow reality that your patients inhabit – a world full of paranormal strangeness and horrors that go bump in your head, where all you have to rely on is your own mind.
Just try not to lose it...
From the developers and creators of "Murderous Muses", "Dark Nights with Poe and Munro" and "The Shapeshifting Detective".
CREDITS
You.............................The Doctor
Aislinn De’Ath..................Marianna
Bianca Beckles-Rose........Jaya
Dom Lister......................Nathan
Helen Jenkinson..............Elin
Helga Ragnars................Claire
Millin Thomas..................Bryce
Mark Kitto.......................Professor Alderby
and guest starring John Guilor as Professor Warwick.
Additional patients played by ...
Carolyn English, Catherine Stacey, John Shields and Rosie Hefferon.
Directed by Tim Cowles.
Note : Steam overlay is only available on the Windows platform for this game.
FAQ
How do you progress through the game?
You play through a series of five therapy sessions. Each session you'll talk to several patients, and traffic lights tell you which patients you've unlocked so you can move on. Yellow is unlocked, but you can keep talking to reach green and find all their possible responses. On the final accusation screen you choose whodunit and if you've picked correctly the game finishes and plays your ending videos. Automatic saves mean there's no way to rollback something you've said to a patient, so be careful with that. That's it in a nutshell, but we can't tell you everything, or there'd be no surprises...
What happens if I ask a question they don't have an answer for?
As long-time fans of FMV games and point-and-click adventures, we're all-too familiar with the 'That's not gonna work' or 'I think I'll have to try that again' phrases repeated over and over. That's why we've given the patients lots of different ways of saying "I don't know" - most have over 40 in fact, including some that contain clues that lead you to new storylines.
Is this game an AI simulator?
No. A lot of the time you might get "don't know" answers to your questions, because there are only 1600+ actual filmed responses in the game. Listen to what patients say and follow their lines of conversation to stay on track. Responses are keyword based, so literally typing words patients have already used will do half the job for you.
How many acts are there?
There are five acts in total. Each act is a self-contained episode, so it's possible to ask questions (and get responses) in any order to reveal the story. Some decisions you make will affect future acts, so once you hit the continue button there's no going back!
What if I get stuck?
We've tried to design the game so you don't get stuck, but if you do, just type 'Hint'. Think of it as asking for advice, and you'll need a lot of it if you're trying to find every response (aka going green). Make sure you've properly watched the help video too. The new 'suggested questions' list also gets you to the finish line without having to type anything.
If the murderer is chosen at random, does that mean it's replayable?
The game can be replayed, but it wasn't designed with that in mind. We wanted everyone to be able to experience as much of the game as possible without needing multiple plays, so branching generally removes just a few responses at a time. That said, you will have to replay the game if you want to find *all* the videos and unlock all the achievements and endings.
The Infectious Madness of Doctor Dekker — game info
- Platforms
- Windows, macOS, Linux / SteamOS
- Steam Deck
- Playable
- Player modes
- Single-player
- PC Game Pass
- Not included
What Steam players say
Recent verbatim reviews from Steam — separate from playze.io community reviews below.
Players consistently praise the game's compelling narrative, excellent acting, and immersive atmosphere that keeps them engaged with the story. However, some find the dialogue system frustratingly strict with its text parsing, where minor spelling errors or grammatical variations cause the game to not recognize intended inputs, which breaks immersion and leads to excessive hint-spamming rather than organic problem-solving.
It's a good game, and the acting is good, the question system is just a little clunky, especially if you use hints. If you use hints, you have to go through pretty much all the questions to unlock hints about questions you asked earlier, so the conversations don't really flow in that sense. You also can't be too specific with questions or you have to word them a certain way to trigger certain responses. One issue I ran into was that I had to use a hint to trigger specific responses, because the game was registering the question as something I'd already asked. I'm excited for the second instalment to release, it looks really good!
While I appreciate the unique ideas behind this game, I find myself in the minority with not enjoying it at all. I did at first, but it was incredibly short lived. The freedom to ask your patients questions is a very clever mechanic, and if executed well could have led to some real immersion in the story. Unfortunately what you get it "guess the trigger word" simulator. It becomes increasingly frustrating when you use a hint to find out that the question you SHOULD be asking is strikingly similar to a question you've already asked, but got a non-response to. It tears apart the immersion and reminds you instantly that all you're doing is probing the system with random keywords to see the next clip. "Tell me more about David" is apparently too similar to "How did David die?" And thus, you cannot ask the latter. All the game cares about is "David". I've already mentioned him, so conversation over. This is not how humans interact with one another. You will find that perfectly reasonable and acceptable questions regarding the patient and their stories are just...ignored. "What do you do during the midnight hour?" ---> "Sorry, I don't know what you're asking." "Tell me more ab…
I'm torn on this one. On one hand: The story is pretty interesting, it's well acted, and I saw it through to the end even though I have no nostalgia for FMV games. On the other hand: It overstays its welcome, you have to have very specific wording for a lot of questions (I ended up using a guide), it starts out really slow, and many of the achievements are weirdly grindy.
Good acting but a little long-winded and was a little relieved at the end so I could stop typing out questions. However, it's an interesting concept, just think it needs a bit of work for the IMoDD2 when that releases.
fun
Arduous
Community reviews
0 reviews
Sign in to write a review.
No reviews yet. Be the first to review this game.
More like The Infectious Madness of Doctor Dekker
News
BlogSilkMU is our new partner: MU Online Season 6 in a browser tab
SilkMU, a MU Online Season 6 server that runs in a browser tab or as an app, opened on 6 November 2026 and is now our partner. What it offers, what is free and what costs WCoin.
Nov 13, 2026
PCGames like Dying Light, where nightfall changes the rules
Games like Dying Light are easy to find if you only want parkour or only want zombies. These eight keep the part that matters: a city that becomes a different place after dark.
Nov 13, 2026
PCGames like Portal 2, where one idea carries the whole game
Games like Portal 2 all share one habit: teach a single impossible trick, then spend a campaign breaking it. From rewinding objects through time to Escher geometry that loops back on itself.
Nov 13, 2026
BundlesPlanet Coaster DLC: skip the collection, buy the packs
The Planet Coaster DLC catalogue closed in 2019, so there is no curve left to wait out. Our record shows the collection bundle costs far more than assembling the same packs one by one.
Nov 13, 2026
XboxToxic Commando Game Pass: subscribe, or buy the key?
The Toxic Commando Game Pass add landed on 12 November. Our price record since late September shows the key route barely moved, which changes what a subscription is worth.
Nov 13, 2026
PCGames like Titanfall 2, for the pilot or for the Titan
Titanfall 2's campaign changed its own rules every mission. Games like Titanfall 2 that keep one part of it — the wall-running, the mech, or a campaign that never settles.
Nov 12, 2026
PCGames like It Takes Two, where the second player is the point
It Takes Two cannot be played alone, and that is the whole design. Games like It Takes Two that give each player a different job — including one that makes do with a single pair of hands.
Nov 12, 2026
XboxFootball Manager 27 Game Pass, and what the old FMs now cost
FM27 landed on 10 November, and Football Manager 27 Game Pass covers it on PC from day one. Steam has stopped selling FM26 and FM24 — our price record shows what that does.
Nov 12, 2026
BlogSilkMU ჩვენი ახალი პარტნიორია: MU Online Season 6 პირდაპირ ბრაუზერში
SilkMU, MU Online-ის Season 6 სერვერი, რომელიც ბრაუზერში ან აპლიკაციად თამაშდება, 6 ნოემბერს გაიხსნა და ახლა playze-ის პარტნიორია. რას გთავაზობს, რა არის უფასო და რა ღირს WCoin.
Nov 13, 2026
PCTekken 8 ღირს თუ არა: 91 ქულა და შერეული შეფასება
Tekken 8 ღირს თუ არა, როცა კრიტიკოსებს 91 ქულა აქვთ დაწერილი, მოთამაშეებს კი „შერეული"? ფასი, ონლაინის მდგომარეობა და უკეთესი ალტერნატივა.
Sep 24, 2026
DealsStellaris იაფად: ოცდახუთი დამატება და ერთი გამოსავალი
Stellaris იაფად ყიდვა საბაზისო თამაშის შემთხვევაში მარტივია. ძვირი დამატებებია — და მათთვის არსებობს ვარიანტი, რომელსაც ბევრი ვერ ამჩნევს.
Sep 24, 2026
PCARK ფასი: Evolved თუ Ascended — რომელი ვიყიდოთ
ARK ფასი ორი სხვადასხვა თამაშის ფასია. რომელი ჯობია ქართული სიიდან, სად არიან მოთამაშეები და რატომ არ ღირს ახალ ვერსიაზე გადახტომა.
Sep 24, 2026
DealsCivilization 6 იაფად: რომელი დამატება ღირს მართლა
Civilization 6 იაფად ყიდვა მარტივია — საბაზისო თამაში იაფია და იაფად რჩება. რთული ის არის, რომ ცხრამეტი დამატებიდან სწორი აირჩიოთ.
Sep 24, 2026
FreebiesCS2 უფასოდ: რა ღირს სინამდვილეში Prime
CS2 უფასოდ ითამაშება საქართველოდანაც და ეს დემო არაა. ფული მხოლოდ Prime-ს სჭირდება — აი, რას იძლევა ის და ვის ღირს.
Sep 24, 2026
PCCuphead ღირს თუ არა: სირთულე, DLC და ორზე თამაში
Cuphead ღირს თუ არა: ექვსივე ქართულ მაღაზიაში ერთი ფასია, მეგობარს კი ასლი საერთოდ არ სჭირდება. სირთულე, ერთადერთი დამატება და როდის ვიყიდოთ.
Sep 23, 2026
DealsRimWorld იაფად: ბაზა, ხუთი დამატება და სწორი რიგი
RimWorld იაფად ყიდვა დამატებების რიგზეა დამოკიდებული, არა ფასდაკლების ლოდინზე. რომელი ხუთიდან ღირს ჯერ და რომელ მაღაზიას აქვს ფასდაკლება.
Sep 23, 2026New releases
All new releases →- AION 2Sep 30, 2026Free
- Onimusha: Way of the SwordSep 25, 2026$39.83
- BLACKWOODSep 16, 2026$17.95
- AniimoSep 16, 2026Free
- WARDOGSSep 10, 2026$29.73
- The Blood of DawnwalkerSep 2, 2026$57.61
- STAR WARS Zero Company™Aug 27, 2026$44.00
- Click the ButtonAug 26, 2026$2.99
- How to FishAug 20, 2026$6.41
- Mortal Shell IIAug 20, 2026$34.86
- GunZ: The DuelAug 14, 2026Free
- Big WalkAug 4, 2026$17.05
- Dancing LineMay 31, 2026$9.99
- Deep Rock Galactic: Rogue CoreMay 20, 2026$14.99
- 93, KuindzhiMay 19, 2026Free
- Black JacketMay 12, 2026$14.99
- Titanium CourtApr 23, 2026$7.67
- Monster Hunter Stories 3: Twisted ReflectionMar 13, 2026$35.57
- R.I.P. - Reincarnation Insurance ProgramJan 26, 2026$14.99
- Wicked SeedJan 23, 2026$19.99
- Nine-Ball RouletteDec 5, 2025$3.99
- City Lights Love Bites Season 0 [Pilot Season]Nov 27, 2025$2.99
- Cowboy Life SimulatorNov 26, 2025$8.60
- Cleared HotNov 20, 2025$16.39
Top games right now
All rankings →- 1Counter-Strike 2Free
- 2Dota 2Free
- 3PUBG: BATTLEGROUNDSFree
- 4Grand Theft Auto V Legacy—
- 5Terraria$2.08
- 6Tom Clancy's Rainbow Six SiegeFree
- 7Rust$20.19
- 8Garry's Mod$6.21
- 9Team Fortress 2Free
- 10Black Myth: Wukong$35.78
- 11HELLDIVERS™ 2$23.99
- 12ELDEN RING$38.88
- 13Apex Legends™Free
- 14Left 4 Dead 2$9.99
- 15Stardew Valley$12.11
- 16Wallpaper Engine$3.93
- 17Cyberpunk 2077$17.99
- 18Euro Truck Simulator 2$4.99
- 19Dead by Daylight$6.83
- 20Red Dead Redemption 2$13.71
- 21The Witcher 3: Wild Hunt$9.77
- 22Baldur's Gate 3$53.64
- 23Phasmophobia$15.19
- 24War ThunderFree
Buy at Kinguin 
















