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Silisko has stated on multiple occasions that he regrets sharing the so-called "plan" and generally wishes people would stop bringing it up. Then, Nova Silisko (the person who conceived it) left the team, and the story was most likely abandoned.
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To the surprise of almost everyone, a proper sequel simply titled Kerbal Space Program 2 was announced at 2019's Gamescom. The number of parts has risen dramatically in later releases, and the community is cranking out fanmade addons at an impressive pace on top of that. Essentially, you have to manage the entire Space Program. The third mode is full-blown Career mode, and you have to juggle a budget, job offers, your Kerbonauts and conduct Science similar to the Science mode (which used to be the old Career mode, prior to 0.24).
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The second version is Science, in which you have to conduct experiments in order to unlock various piece parts, as you start off with just the very basics.
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You're set loose upon a space center complete with a vehicle assembly building and a launch pad, a bin full of rocket parts, ground personnel composed entirely of yes-men who build and wheel onto the launch pad anything you design no matter how crazy it is, and some astronauts to crew your creations.
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The game offers three game modes to suit your style of play. Superficially similar to Orbiter, the difference between the two has been likened to the difference between making to-scale miniatures for architectural design and playing with LEGO bricks with rocket fuel in them, which you then hurl with glee at your sister note Although the Real Solar System and Realism Overhaul mods let you be more like the former. Kerbal Space Program is a game about a green humanoid species known as the Kerbals as they start a space program.
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