Pyramid Solitaire Duel, Make 13 your lucky number by mastering these tricky card pyramids!. GameDuell is one of the world's largest gaming communities. Free online games with millions of real players and real prizes. Huge selection of online games. We collected 10 of the best free online duel games. Here we show you games 1 - 10, including Raft Wars 2, Dead Samurai 2, Gunblood, and many more free.