Rozer joined NUMA late in 2008. He is known for being a frame by frame speedrunner. He frequently posts fbf'd demos on maps submitted to NUMA, although his fbf'd runs are sometimes beaten by the best reail-time speedrunners. He usually combats this by saying his demos are innovation of new routes. Rozer is also known for making some impressive KRADDA's.
Despite having played for over a year, Rozer complete his first column, 13, in early 2010. He unlocked his first flavour by completing column 0 in late august of the same year. He also gives lessons to Koumori, a new player to N, who, thanks to Rozer's tutoring, has already completed 2 columns within a week.