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Setup:
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Do these things to get the game up and running
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Run nova.nes in a NES emulator. Check out View controls in Main menu, then go to Game options and set things to whatever you want (like acceleration and run speed to fast maybe). Selecting Start game in Options takes you to the level select menu, where selecting 1-1 takes you to one more menu screen. Timing begins on selecting Start! there.
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Start: 
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Start: Level 1-1 menu
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End: 
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End: World 2 completed
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Continue system: 
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Continue system: Restart from checkpoint on death
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Game info:
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Controls, whatever else you need to know to play
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Some levels like 1-1 have an intro, most don't and will only have the other three options. If you select Show intro instead of Start! by accident, pressing Start will skip all of it at once. 
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The floating stars are checkpoints. The in-game signs usually explain some mechanics and it's generally advisable to read them. Gold can be used to buy consumables from item shop between stages - after the first world the "??????????" menu option will unlock and become an item shop. There's a cheat of holding select to access it early and to buy items without spending gold - that's illegal, don't do that.