Question

Does going into challenge mode/ easy mode delete your data?

Answer 1

Nope.

Source: I have Challenge Mode on my White 2 right now.

Comments

Ok, so it's not one of those things where you play the whole game over again, only it's harder.

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Yeah..

Answer 2

Of course not, it just makes the game easier(white2)/harder(black2).

Soure: Easy mode on White2