I've defeated the final boss in a very cheesy way (Babarian Tank with a lot of Damage Return).
Now I have a hard time even getting some money in the castle of New Game Plus - is there some way to return to the old "easy" castle ?
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Sign up to join this communityNo, you cannot return to the original 'easy' castle.
However, if you find NG+ difficult: Equip grace runes.
Grace runes lower the level of the monsters making them easier to kill.
In the early levels of NG+ grace runes also turn the tier 2 enemies back into thier tier 1 form. This can effectively turn the castle back to it's 'easy' form for a while.
You can edit the save file: 'RogueLegacyPlayer.rcdat' using a hex-editor.
The value to change will vary based on your save data. For me as +2, the value to edit was located on the 5th line (00:00000040) as the 15th value in the row (second last). Be sure to copy a backup and change the value to your desired number of completions (IE 01 for new game+). The value maps to 'TimesCastleBeaten'.
Hope this helps