The Concentration Cube is a 'harvestable' and a monster drop that was introduced during the Ratboy's Nightmare Update. It is one of the many collectibles that are needed by the players in order to complete the entries of the Itempedia of the Nightmare.
It is typically found on the floors of many zones, although it is possible to find the Concentration Cube on props or platforms that players may or may not notice as they explore the zones of the Nightmare. There are various places and sources to acquire the Concentration Cube that include the following:
- Anywhere in the following locations:
- A possible drop from the Democan.
As implied by its description, the Concentration Cube is described to be a scary cube that is hard to look at. The Concentration Cube appears to be made out of stones that may or may not originate from the Nightmare, specifically ones found on The Road and/or the End of the Road.
The Concentration Cube does not have any usages in-game that will benefit the players, other than to be sold to a selling vendor at a selling price of 9,000 gold.
- This is not to be confused with the Freedom Cube.