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In [[Wikipedia:Microsoft|Microsoft]]'s [[Wikipedia:Microsoft Excel|Excel 95]] spreadsheet program (included in the [[Wikipedia:Microsoft Office|Microsoft Office 95]] [[Wikipedia:Office suite|office suite]]), there is an Easter egg known as the ''Hall of Tortured Souls'', a three dimensional raycasting game engine created as an homage to ''Doom''. [http://www.eeggs.com/items/719.html] The existence of this Easter egg is one of the results of the "religion" said to have arisen on the Microsoft campus in the wake of Doom's release. <ref name="mastersofdoom">Kushner, David. [[Masters of Doom|Masters of Doom: How Two Guys Created an Empire and Transformed Pop Culture]]. Random House Publishing Group, 2003. ISBN 0-375-50524-5</ref>Easter eggs were present in Excel 5 through Excel 2000. Microsoft stopped including Easter eggs in its current versions of [http://www.excel-easy.com Microsoft Excel].