So, Mist found a huge bug, that allows you to unlock all items in the game and get 999k Red Orbs / 999k Proud Souls before you start the run. Aaand... you can't use it in your runs. Glitch is PC exclusive, as Consoles don't have PT.

Replication: 0) If you got Steam version of the game - turn off Steam Cloud.

1. Launch the game normally, with fresh save.
2. Go to Perfomance Test.
3. Switch to the save folder, located in \CAPCOM\DEVILMAYCRY4SPECIALEDITION
4. Delete the savefile.
5. Switch back to the game, select the character, select the difficulty.
6. Check Power Up menu, if you did anything correctly, you'll notice it.

That was fast. :)