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how do i get more hp/sp/str like that and wallpaper/post cards/ and rare items it would help ^^

After you fully upgrade all of the Lost Weapons, you'll be able to get stat-up items in exchange for Virus Cores from Wise Grunty in Netslum Tartarga. 'Course, by then there really isn't much point

And as for the wallpapers and greeting cards, you can do that in all versions of the game. Talk to Death Grunty in Canard's @HOME and view the Book of 1000 - the higher the rankings, the more bonuses you get.

ok ty

You can also do the bike missions during the game you can get hp and sp items and weapon leveling items also by getting chim chims during each mission and it also unlocks more bike parts for you you just have to use the first keyword passing.