Do I have to build the whole engine from scratch in game dev tycoon every time I add a feature?

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If I have an engine with lots of features and now I need to add to the engine something like "Save to cloud" or some other thing. Do I need do rebuild the whole engine? Do I need a complete remake of the same graphics and sound systems if I want to add things like "Save to cloud" and "Day/Night cycle"?
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How long does it take to make a game engine from scratch?
Game Engine development can take anywhere from a couple of days, to years. The expertise needed to make a small functional engine is a lot higher than the expertise needed to make a small functional game from an existing engine (keep that in mind). As an example, I made a 2D engine in about 6 months.What does engine do in Game Dev Tycoon?
what does the engine do in game dev tycoon ? Hi there, The engine is the structure behind your game (graphics, sound, gameplay mechanics, special features). If you notice, at the beginning of the game you can only pick a few features, but as time goes on and technology develops you can add more and more things to it.Is it worth creating your own game engine?
Using your own engine won't make you sell more copies of your game automatically. And while you *can* save time in the long run, this usually means having your engine be good enough to carry you across multiple projects, while also providing you with significant workflow improvements compared to commercial engines.Do the percentages matter Game Dev Tycoon?
Everything below 100% (not showing) is a waste. The percentage shows how effective the extra features you added in the sidebar will be. If you have a ton of AI features, but no AI design points it is going to be very ineffective.Game dev Tycoon Time to make a new game engine
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