When interacting with objects, the options available to the player include look/inquire, touch/manipulate, and move, denoted by a "?", a hand, and four arrows pointing inwards respectively. Every room, person and object in the normal world has a Dark World equivalent and this is often necessary for puzzle solving. Dawson is able to access the Dark World on day two upon receiving a piece of a mirror in the mail and re-assembling it with the rest of the mirror, creating a portal to the Dark World. If it becomes night while Dawson is in the Dark World, he will fall asleep and die, resulting in a game over. each night, regardless of where the player is. Dawson automatically goes to sleep at ten P.M. At the end of each day, Dawson goes to sleep and upon going to bed, each night he has a nightmare of the Dark World. Time can also be passed by using the in-game wait function, and the time can be checked by looking at Dawson's watch, or by inspecting the grandfather clock in the house. The player has three real time hours within which they must complete the game, which is the equivalent of three in-game days. As a result, you often have to play the game several times over, going through scenes you've seen countless times before". Amiga Format, in its review, stated with regards to Dark Seed's gameplay: "Too many things in the game need to be done within a specific time, or in a certain order, and you don't necessarily know when you've passed that 'critical point' after which you're fighting a lost cause. As a result of this, one must start over repeatedly to win without resorting to a walkthrough.
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Unlike most point-and-click adventure games, which give the player time to explore, many actions in Dark Seed must occur within precise time limits, or the game will end up in an unwinnable state. Mike then states that he's just beginning to understand. A morphing animation reveals that, unbeknownst to the librarian, she is the Keeper of the Scrolls' counterpart. The medication will presumably kill the embryo inside his head. The game ends with the town librarian visiting Mike and telling him she found some pills in her purse prescribed to Mike. On the third and final day, Mike executes an elaborate plan that culminates with the Ancient ship's departure on the Dark World, depriving them of their power source, and the destruction of the living room mirror, sealing the Ancients out of the Normal World. The only way to stop this, she says, is to destroy the Ancients' Power Source.
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She tells him that the nightmare he had on his first night was real and warns him that if the embryo-the eponymous Dark Seed-is born, it will kill him and all of humanity. On the second day, he travels to that universe through the living room mirror and meets the Keeper of the Scrolls, a friendly darkworlder. He finds clues about the previous owner's death, which reveal the existence of a parallel universe called the Dark World ruled by sinister aliens called the Ancients. He wakes up with a large headache and, after taking a painkiller and a shower, explores the mansion. On his first night at the house, Mike has a nightmare about being imprisoned by a machine that shoots an alien embryo into his brain. Mike Dawson is a successful advertising executive and writer who has recently bought an old mansion on Ventura Drive (named after Ventura Boulevard) in the small town of Woodland Hills.