Closer to being the same idea developed at the same time with both being influenced by LEGO. Blockland: November 15, 2004 (Freeware) February 24, 2007 (Retail)

Closer to being the same idea developed at the same time with both being influenced by LEGO. Blockland: November 15, 2004 (Freeware) February 24, 2007 (Retail) ROBLOX: March 23, 2004 (Beta) August 27, 2006 (Retail)