1. You can open Time Cube up to 3 times a day for free.

2. You can open Time Cube additionally by using [Accelerator].

You can get it from Grabert Store, Pop-up Store, Odette's request, and Dimension Gap. 

3. Dimension Cube is always open, and the same grade heroes share equal ratio in the summon rate.

4. Pick-Up Cube is a cube given only during an event. Pick-up heroes have increased summon rate compared to other heroes.
5. If you summoned Pick-Up Cube 100 times, your next summon(101st) guarantees a pick-up hero.