Ages: when we say "made for ages 4 to 104," we mean it. Visual Connections tap into a unique and innate human intelligence. We don't get better at Visual Connections as we age...in fact, don't be surprised if the kids at the game table see connections that the adults don't.
Number of Players: OuiSi is VERY flexible in this way. It's enjoyable solo. It's a terrific for just two players. But you can also enjoy in larger groups, from 2 to 12. In fact, we know of groups as large as 25 who have used just one set (though we generally recommend the combo of OuiSi Original and OuiSi Nature for groups larger than 10).