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Sega Ages 2500 Series Vol. 15: Decathlete Collection (SEGA AGES 2500シリーズ Vol.15 デカスリート・コレクション) is the fifteenth entry in the Sega Ages 2500 series for the PlayStation 2.
Decathlete Collection stands as the second compilation in the series and the final game to be developed by 3D-Ages. It contains Decathlete, Winter Heat and Virtua Athlete 2K, all sporting improved graphics and other minor adjustments. It's missing some features, such as the ability to create characters and the internet features of Virtua Athelete 2K, but it adds more computer players to Decathlete and changes some camera angles.