Killergran on 10 March 2009
Cave Story.
It's an awesome platformer somewhat in the same genre as Metroid. It's free, but much higher quality than most freeware. It most certainly does not require a graphics card.
You can download at: http://www.acid-play.com/download/cave-story/
Or: http://www.miraigamer.net/cavestory/downloads_1.php
Or: http://www.download-free-games.com/freeware_games/cave_story.htm
You could also try Mushroom Tower Defense, a pretty fun tower defense game: http://www.newgrounds.com/portal/view/481618
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