Hi Can someone tell me how make a basic romhack new levels new title screen new world map and stuff like that thank you very much
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Edited worldmaps u can do with goombatlas, but u cant add like world 9 on it, new title screen requires code, and new levels too, unless u want to edit only existing ones
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i wnt to edit the existing ones

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jpg the post was about nsmb2

as for the initial question for editing levels youd use coinkiller— first youd need to dump the romfs from a nsmb2 rom, which you can do with a modded 3ds or citra. from that point editing levels with coinkiller seems straightforward enough, but i dunno enough on nsmb2 modding personally to give any info beyond that