1,200 NX (1)
12,000 NX (11)
Red Cubes are used to reset revealed Potential stats on equipment items. Items with hidden Potential on them are most commonly obtained as drops from monsters, from event rewards or coin shops, if you transform them yourself using a Potential Scroll or Tim's Secret Lab, or if items with Potential are fused. Each Red Cube can only be used once. This item can be found in the Equipment Modifications > Miracle Cubes category in the Cash Shop.
Here's how to use a Red Cube:
As a bonus, you will receive a Red Cube Fragment in the Use tab of your item inventory. After you collect 10 of these, double-click them to obtain an Advanced Potential Scroll, or combine 20 to earn a Perfect Awakening Stamp.