Welsh, Oil (14 November 2008). "Geometry Wars: Retro Explained". Eurogamer.net. p. 1. Archived from the original on 3 September 2014. Retrieved 11 December 2019.
Welsh, Oil (14 November 2008). "Geometry Wars: Retro Explained". Eurogamer.net. p. 1. Archived from the original on 3 September 2014. Retrieved 11 December 2019.