Plot: Microsoft Solitaire Collection is a video game included with Windows 10. It is developed by Next Level Games via the Microsoft Casual Games. It replaces Solitaire, FreeCell and Spider Solitaire included with the previous versions of Windows. Wikipedia
Plot: Microsoft Mahjong is a computer game version of mahjong solitaire published by Microsoft. The version titled Mahjong Titans was developed by Oberon Games and included in Windows Vista and Windows 7. Wikipedia