That game followed Land Air Sea Warfare, which was the sequel to Machines at War. (geardiary.com)
As an introduction, Figures 1 and 2 compare the HADCRUT4 data (combined global land air plus sea surface temperature anomalies) to the two datasets from Cowtan and Way (2013). (wattsupwiththat.com)
Smith, T.M. and R.W. Reynolds, 2005: A global merged land air and sea surface temperature reconstruction based on historical observations (1880 - 1997), J. Clim., 18, 2021 - 2036. (ncdc.noaa.gov)