Microsoft introduced an operating environment named Windows on November 20, 1985, as a graphical operating system shell for MS-DOS in response to the growing interest in graphical user interfaces (GUIs). Microsoft Windows came to dominate the world's personal computer (PC) market with over 90% market share, overtaking Mac OS, which had been introduced in 1984.
Singleplayer is one player
The only criterion for being classified as freeware is that the software must be fully functional for an unlimited time with no cost, monetary or otherwise. The software license may impose restrictions on the type of use including personal use, individual use, non-profit use, non-commercial use, academic use, commercial use or any combination of these. For instance, the license may be "free for personal, non-commercial use".
Accordingly, freeware may or may not be free software / open source software, the principal difference being that free software can be used, studied, and modified without restriction; free software embodies the concept of 'libre' while freeware that of 'gratis'. Freeware is also different from shareware; the latter obliges the user to pay after some trial period or to gain additional functionality.
Here's a list of freeware games freely available: Link »
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