The Infectious Madness of Doctor Dekker

The Infectious Madness of Doctor Dekker

D'Avekki Studios Ltd · May 19, 2017 · FMV, Lovecraftian, Atmospheric, Dark, Indie

Buy The Infectious Madness of Doctor Dekker from GOG at $2.69 — the cheapest of 8 stores we compare.

PC
Very Positive82% · 61978Metacritic1playing now
Best price 51 Good deal
$2.69-70%
$8.99lowest tracked $2.06
GOG Buy at GOG

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Where to buy The Infectious Madness of Doctor Dekker — official stores

GOG
GOG
Standard Edition · DRM-Free
-70%
$2.69
$8.99
Buy
Fanatical
Standard Edition · Steam
-25%
$6.73
$8.99
Buy
GreenManGaming
Standard Edition · Steam
-15%
$7.64
$8.99
Buy
Steam
Steam
Standard Edition · Steam
$8.99
Buy
Humble Store
Humble Store
Standard Edition · Steam
$8.99
Buy

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.

Eneba
Standard Edition · Steam
$3.22
Buy
Gameseal
Standard Edition · Steam
$3.44
Buy
Driffle INC
Standard Edition · Steam
$3.73
Buy

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The Infectious Madness of Doctor Dekker price by region

The Infectious Madness of Doctor Dekker costs £2.58 in the United Kingdom, $2.69 in the United States, €2.69 in Europe (EUR), $5.99 in Georgia (USD), CA$7.48 in Canada, A$9.69 in Australia, NZ$13.25 in New Zealand, zł14.37 in Poland and R$19.41 in Brazil right now.

Cheapest The Infectious Madness of Doctor Dekker offer in each region, in local currency
RegionBest priceOfficial storeKey shopStores
United Kingdom £2.58 −51% £5.23 £2.58 4
United Statesyour region $2.69 −70% $2.69 $3.22 8
Europe (EUR) €2.69 −70% €2.69 €2.84 9
Georgia (USD) $5.99 $5.99 — 1
Canada CA$7.48 −25% CA$7.48 — 2
Australia A$9.69 −25% A$9.69 — 2
New Zealand NZ$13.25 NZ$13.25 — 1
Poland zł14.37 −65% zł40.99 zł14.37 3
Brazil R$19.41 −35% R$29.99 R$19.41 2

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

YOU are a psychiatrist, trying to solve a murder whilst treating the unusual patients of the recently deceased Doctor Dekker - but nothing is as it seems.

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
More games like this:Mac gamesLinux games

What Steam players say

Recent verbatim reviews from Steam — separate from playze.io community reviews below.

✦ AI summary

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.

Not recommended Sep 16, 2026
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…
Recommended Sep 10, 2026
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.
Recommended Sep 2, 2026
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.
Recommended Aug 24, 2026
fun
Not recommended Aug 11, 2026
Arduous
Recommended Aug 10, 2026
It's a proper mystery and in no way holds your hand about solving it. The question-response system is unique and clever game design. However, it grows to be a bit tedious at times because you'll ask a question in direct response to what was said and still get no answer. I've been having to take real-life notes on character info, so for the next game I hope they improve the note system so the player can actually take dedicated notes on each suspect. All in all a fun, creepy experience.

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