LodeFunner - level editor for Lode Runner [NES].

Download link: 
http://www.romhacking.net/utilities/497/
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Instruction:
1.Install the patch.
2.Rename ROM file "Lode Runner (J) [!].nes" to "Lode_bullet.nes".
3.Copy "LevelsOffsets.cfg" in to "lodefunner" folder.
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You can set offsets manualy:
 Level Start: 6A88
 Level Stop: 800A
 Graphics: 9610
 Palettes: 438E
 Level Number: 4663
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To get rid of the message about lack of free space, import empty levels:
1.Menu->Load file.
2.Menu->Levels->Import All Levels or Ctrl+V.