Boulders have difficulty grades. The most accepted standard to rate this is Fontainebleau standard , which is also how the boulders are graded in Toplogger.

However, Cube made it's own new standard (why oh, why?). Use this converter to get a bit of a sense of what you're doing, and bring a bit of sanity back in this world!

Grade conversion based on observation and gut feeling. No rights can be blah, blah, disclaimer for everything. Have fun climbing!